diff --git a/CHANGELOG b/CHANGELOG
index bffffd612..a7e71daf6 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,6 +1,10 @@
 CHANGELOG Roundcube Webmail
 ===========================
 
+- Fix imap_cache setting to values other than 'db' (#1488060)
+- Fix handling of attachments inside message/rfc822 parts (#1488026)
+- Make list of mimetypes that open in preview window configurable (#1487625)
+- Added plugin hook 'message_part_get' for attachment downloads
 - Fixed selecting identity on reply/forward (#1487981)
 - Fix image type check for contact photo uploads
 
diff --git a/config/main.inc.php.dist b/config/main.inc.php.dist
index 85afa8c7f..94bb79fb1 100644
--- a/config/main.inc.php.dist
+++ b/config/main.inc.php.dist
@@ -326,6 +326,11 @@ $rcmail_config['dont_override'] = array();
 // 3 - one identity with possibility to edit all params but not email address
 $rcmail_config['identities_level'] = 0;
 
+// Mimetypes supported by the browser.
+// attachments of these types will open in a preview window
+// either a comma-separated list or an array: 'text/plain,text/html,text/xml,image/jpeg,image/gif,image/png,application/pdf'
+$rcmail_config['client_mimetypes'] = null;  # null == default
+
 // mime magic database
 $rcmail_config['mime_magic'] = '/usr/share/misc/magic';
 
diff --git a/plugins/acl/acl.js b/plugins/acl/acl.js
index d78607690..4b1431ac3 100644
--- a/plugins/acl/acl.js
+++ b/plugins/acl/acl.js
@@ -1,7 +1,7 @@
 /**
  * ACL plugin script
  *
- * @version 0.6
+ * @version 0.6.1
  * @author Aleksander Machniak <alec@alec.pl>
  */
 
@@ -11,7 +11,7 @@ if (window.rcmail) {
             rcmail.acl_list_init();
             // enable autocomplete on user input
             if (rcmail.env.acl_users_source) {
-                rcmail.init_address_input_events($('#acluser'), {action:'plugin.acl-autocomplete'});
+                rcmail.init_address_input_events($('#acluser'), {action:'settings/plugin.acl-autocomplete'});
                 // fix inserted value
                 rcmail.addEventListener('autocomplete_insert', function(e) {
                     if (e.field.id != 'acluser')
@@ -52,7 +52,7 @@ rcube_webmail.prototype.acl_delete = function()
     var users = this.acl_get_usernames();
 
     if (users && users.length && confirm(this.get_label('acl.deleteconfirm'))) {
-        this.http_request('plugin.acl', '_act=delete&_user='+urlencode(users.join(','))
+        this.http_request('settings/plugin.acl', '_act=delete&_user='+urlencode(users.join(','))
             + '&_mbox='+urlencode(this.env.mailbox),
             this.set_busy(true, 'acl.deleting'));
     }
@@ -82,7 +82,7 @@ rcube_webmail.prototype.acl_save = function()
         return;
     }
 
-    this.http_request('plugin.acl', '_act=save'
+    this.http_request('settings/plugin.acl', '_act=save'
         + '&_user='+urlencode(user)
         + '&_acl=' +rights
         + '&_mbox='+urlencode(this.env.mailbox)
@@ -120,7 +120,7 @@ rcube_webmail.prototype.acl_mode_switch = function(elem)
 {
     this.env.acl_advanced = !this.env.acl_advanced;
     this.enable_command('acl-delete', 'acl-edit', false);
-    this.http_request('plugin.acl', '_act=list'
+    this.http_request('settings/plugin.acl', '_act=list'
         + '&_mode='+(this.env.acl_advanced ? 'advanced' : 'simple')
         + '&_mbox='+urlencode(this.env.mailbox),
         this.set_busy(true, 'loading'));
diff --git a/plugins/acl/acl.php b/plugins/acl/acl.php
index 1b021d00a..976b36260 100644
--- a/plugins/acl/acl.php
+++ b/plugins/acl/acl.php
@@ -3,7 +3,7 @@
 /**
  * Folders Access Control Lists Management (RFC4314, RFC2086)
  *
- * @version 0.6
+ * @version 0.6.1
  * @author Aleksander Machniak <alec@alec.pl>
  *
  *
@@ -25,7 +25,7 @@
 
 class acl extends rcube_plugin
 {
-    public $task = 'settings|addressbook';
+    public $task = 'settings|addressbook|calendar';
 
     private $rc;
     private $supported = null;
@@ -44,6 +44,7 @@ class acl extends rcube_plugin
         $this->add_hook('folder_form', array($this, 'folder_form'));
         // kolab_addressbook plugin
         $this->add_hook('addressbook_form', array($this, 'folder_form'));
+        $this->add_hook('calendar_form_kolab', array($this, 'folder_form'));
         // Plugin actions
         $this->register_action('plugin.acl', array($this, 'acl_actions'));
         $this->register_action('plugin.acl-autocomplete', array($this, 'acl_autocomplete'));
@@ -526,7 +527,7 @@ class acl extends rcube_plugin
         $list      = array();
         $attrib    = array(
             'name' => 'rcmyrights',
-            'style' => 'padding: 0 15px;',
+            'style' => 'margin:0; padding:0 15px;',
         );
 
         foreach ($supported as $right) {
diff --git a/plugins/acl/skins/default/acl.css b/plugins/acl/skins/default/acl.css
index cd8f4b72e..e46a1d00b 100644
--- a/plugins/acl/skins/default/acl.css
+++ b/plugins/acl/skins/default/acl.css
@@ -81,7 +81,7 @@
 
 #aclform
 {
-  top: 100px;
+  top: 80px;
   width: 480px;
   padding: 10px;
 }
diff --git a/plugins/new_user_dialog/new_user_dialog.php b/plugins/new_user_dialog/new_user_dialog.php
index 0d6837335..9d7cbcba5 100644
--- a/plugins/new_user_dialog/new_user_dialog.php
+++ b/plugins/new_user_dialog/new_user_dialog.php
@@ -66,6 +66,20 @@ class new_user_dialog extends rcube_plugin
         'disabled' => ($identities_level == 1 || $identities_level == 3)
       )));
 
+      $table->add('title', $this->gettext('organization'));
+      $table->add(null, html::tag('input', array(
+        'type' => 'text',
+        'name' => '_organization',
+        'value' => $identity['organization']
+      )));
+
+      $table->add('title', $this->gettext('signature'));
+      $table->add(null, html::tag('textarea', array(
+        'name' => '_signature',
+        'rows' => '3',
+      ),$identity['signature']
+      ));
+
       // add overlay input box to html page
       $rcmail->output->add_footer(html::div(array('id' => 'newuseroverlay'),
         html::tag('form', array(
@@ -106,6 +120,8 @@ class new_user_dialog extends rcube_plugin
     $save_data = array(
       'name' => get_input_value('_name', RCUBE_INPUT_POST),
       'email' => get_input_value('_email', RCUBE_INPUT_POST),
+      'organization' => get_input_value('_organization', RCUBE_INPUT_POST),
+      'signature' => get_input_value('_signature', RCUBE_INPUT_POST),
     );
 
     // don't let the user alter the e-mail address if disabled by config
@@ -125,4 +141,4 @@ class new_user_dialog extends rcube_plugin
 
 }
 
-?>
\ No newline at end of file
+?>
diff --git a/plugins/new_user_dialog/newuserdialog.css b/plugins/new_user_dialog/newuserdialog.css
index c03e6fd42..1c3e652b6 100644
--- a/plugins/new_user_dialog/newuserdialog.css
+++ b/plugins/new_user_dialog/newuserdialog.css
@@ -48,7 +48,8 @@
   white-space: nowrap;
 }
 
-#newuseroverlay table td input
+#newuseroverlay table td input,
+#newuseroverlay table td textarea
 {
   width: 20em;
 }
diff --git a/program/include/main.inc b/program/include/main.inc
index 0401fe2c1..7e85e01fb 100644
--- a/program/include/main.inc
+++ b/program/include/main.inc
@@ -1021,7 +1021,7 @@ function rcube_strtotime($date)
  */
 function format_date($date, $format=NULL)
 {
-  global $CONFIG;
+  global $RCMAIL, $CONFIG;
   
   $ts = NULL;
 
@@ -1032,13 +1032,7 @@ function format_date($date, $format=NULL)
     return '';
 
   // get user's timezone
-  if ($CONFIG['timezone'] === 'auto')
-    $tz = isset($_SESSION['timezone']) ? $_SESSION['timezone'] : date('Z')/3600;
-  else {
-    $tz = $CONFIG['timezone'];
-    if ($CONFIG['dst_active'])
-      $tz++;
-  }
+  $tz = $RCMAIL->config->get_timezone();
 
   // convert time to user's timezone
   $timestamp = $ts - date('Z', $ts) + ($tz * 3600);
@@ -1659,12 +1653,13 @@ function rcmail_replace_emoticons($html)
  * @param string $from       Sender address string
  * @param array  $mailto     Array of recipient address strings
  * @param array  $smtp_error SMTP error array (reference)
- * @param string $body_file  Location of file with saved message body (reference)
+ * @param string $body_file  Location of file with saved message body (reference),
+ *                           used when delay_file_io is enabled
  * @param array  $smtp_opts  SMTP options (e.g. DSN request)
  *
  * @return boolean Send status.
  */
-function rcmail_deliver_message(&$message, $from, $mailto, &$smtp_error, &$body_file, $smtp_opts=null)
+function rcmail_deliver_message(&$message, $from, $mailto, &$smtp_error, &$body_file=null, $smtp_opts=null)
 {
   global $CONFIG, $RCMAIL;
 
@@ -1823,17 +1818,10 @@ function rcmail_gen_message_id()
 // Returns RFC2822 formatted current date in user's timezone
 function rcmail_user_date()
 {
-  global $CONFIG;
+  global $RCMAIL, $CONFIG;
 
   // get user's timezone
-  if ($CONFIG['timezone'] === 'auto') {
-    $tz = isset($_SESSION['timezone']) ? $_SESSION['timezone'] : date('Z')/3600;
-  }
-  else {
-    $tz = $CONFIG['timezone'];
-    if ($CONFIG['dst_active'])
-      $tz++;
-  }
+  $tz = $RCMAIL->config->get_timezone();
 
   $date = time() + $tz * 60 * 60;
   $date = gmdate('r', $date);
diff --git a/program/include/rcmail.php b/program/include/rcmail.php
index 1e13624d7..03b536b3e 100644
--- a/program/include/rcmail.php
+++ b/program/include/rcmail.php
@@ -413,7 +413,10 @@ class rcmail
         $id = '0';
 
     // use existing instance
-    if (isset($this->address_books[$id]) && is_a($this->address_books[$id], 'rcube_addressbook') && (!$writeable || !$this->address_books[$id]->readonly)) {
+    if (isset($this->address_books[$id]) && is_object($this->address_books[$id])
+      && is_a($this->address_books[$id], 'rcube_addressbook')
+      && (!$writeable || !$this->address_books[$id]->readonly)
+    ) {
       $contacts = $this->address_books[$id];
     }
     else if ($id && $ldap_config[$id]) {
@@ -1183,7 +1186,7 @@ class rcmail
       $this->smtp->disconnect();
 
     foreach ($this->address_books as $book) {
-      if (is_a($book, 'rcube_addressbook'))
+      if (is_object($book) && is_a($book, 'rcube_addressbook'))
         $book->close();
     }
 
diff --git a/program/include/rcube_config.php b/program/include/rcube_config.php
index 9379e9e7b..31b7ed6b7 100644
--- a/program/include/rcube_config.php
+++ b/program/include/rcube_config.php
@@ -220,6 +220,19 @@ class rcube_config
         return $this->prop;
     }
 
+    /**
+     * Special getter for user's timezone
+     */
+    public function get_timezone()
+    {
+      $tz = $this->get('timezone');
+      if ($tz == 'auto')
+        $tz = isset($_SESSION['timezone']) ? $_SESSION['timezone'] : date('Z') / 3600;
+      else
+        $tz = intval($tz) + intval($this->get('dst_active'));
+
+      return $tz;
+    }
 
     /**
      * Return requested DES crypto key.
diff --git a/program/include/rcube_html_page.php b/program/include/rcube_html_page.php
index 200233c5d..21301e331 100644
--- a/program/include/rcube_html_page.php
+++ b/program/include/rcube_html_page.php
@@ -212,7 +212,7 @@ class rcube_html_page
         if (!empty($this->scripts['docready'])) {
             $this->add_script('$(document).ready(function(){ ' . $this->scripts['docready'] . "\n});", 'foot');
         }
-        
+
         if (is_array($this->script_files['foot'])) {
             foreach ($this->script_files['foot'] as $file) {
                 $page_footer .= sprintf($this->script_tag_file, $file);
@@ -246,7 +246,7 @@ class rcube_html_page
 
         // add page hader
         if ($hpos) {
-            $output = substr($output,0,$hpos) . $page_header . substr($output,$hpos,strlen($output));
+            $output = substr_replace($output, $page_header, $hpos, 0);
         }
         else {
             $output = $page_header . $output;
@@ -254,7 +254,7 @@ class rcube_html_page
 
         // add page footer
         if (($fpos = strripos($output, '</body>')) || ($fpos = strripos($output, '</html>'))) {
-            $output = substr($output, 0, $fpos) . "$page_footer\n" . substr($output, $fpos);
+            $output = substr_replace($output, $page_footer."\n", $fpos, 0);
         }
         else {
             $output .= "\n".$page_footer;
@@ -268,7 +268,7 @@ class rcube_html_page
             foreach ($this->css_files as $file) {
                 $css .= sprintf($this->link_css_file, $file);
             }
-            $output = substr($output, 0, $pos) . $css . substr($output, $pos);
+            $output = substr_replace($output, $css, $pos, 0);
         }
 
         $this->base_path = $base_path;
@@ -289,7 +289,7 @@ class rcube_html_page
                 echo $hook['content'];
         }
     }
-    
+
     /**
      * Callback function for preg_replace_callback in write()
      *
diff --git a/program/include/rcube_imap.php b/program/include/rcube_imap.php
index 6a35af0a8..1b311127c 100644
--- a/program/include/rcube_imap.php
+++ b/program/include/rcube_imap.php
@@ -3074,6 +3074,9 @@ class rcube_imap
         if (isset($data['folders'])) {
             $a_folders = $data['folders'];
         }
+        else if (!$this->conn->connected()) {
+           return array();
+        }
         else {
             // Server supports LIST-EXTENDED, we can use selection options
             $config = rcmail::get_instance()->config;
@@ -3834,13 +3837,13 @@ class rcube_imap
     /**
      * Enable or disable indexes caching
      *
-     * @param boolean $type Cache type (@see rcmail::get_cache)
+     * @param string $type Cache type (@see rcmail::get_cache)
      * @access public
      */
     function set_caching($type)
     {
         if ($type) {
-            $this->caching = true;
+            $this->caching = $type;
         }
         else {
             if ($this->cache)
@@ -3857,7 +3860,7 @@ class rcube_imap
     {
         if ($this->caching && !$this->cache) {
             $rcmail = rcmail::get_instance();
-            $this->cache = $rcmail->get_cache('IMAP', $type);
+            $this->cache = $rcmail->get_cache('IMAP', $this->caching);
         }
 
         return $this->cache;
diff --git a/program/include/rcube_message.php b/program/include/rcube_message.php
index 4f9a2f230..4e2595550 100644
--- a/program/include/rcube_message.php
+++ b/program/include/rcube_message.php
@@ -286,7 +286,7 @@ class rcube_message
         if ($message_ctype_primary == 'text' && !$recursive) {
             $structure->type = 'content';
             $this->parts[] = &$structure;
-            
+
             // Parse simple (plain text) message body
             if ($message_ctype_secondary == 'plain')
                 foreach ((array)$this->uu_decode($structure) as $uupart) {
@@ -306,7 +306,7 @@ class rcube_message
 
             foreach ($structure->parts as $p => $sub_part) {
                 $sub_mimetype = $sub_part->mimetype;
-        
+
                 // check if sub part is
                 if ($sub_mimetype == 'text/plain')
                     $plain_part = $p;
@@ -323,7 +323,7 @@ class rcube_message
                 $this->parse_alternative = true;
                 $this->parse_structure($structure->parts[$related_part], true);
                 $this->parse_alternative = false;
-        
+
                 // if plain part was found, we should unset it if html is preferred
                 if ($this->opt['prefer_html'] && count($this->parts))
                     $plain_part = null;
@@ -432,7 +432,7 @@ class rcube_message
                         $this->attachments[] = $mail_part;
                 }
                 // part message/*
-                else if ($primary_type=='message') {
+                else if ($primary_type == 'message') {
                     $this->parse_structure($mail_part, true);
 
                     // list as attachment as well (mostly .eml)
@@ -496,6 +496,10 @@ class rcube_message
                         $this->attachments[] = $mail_part;
                     }
                 }
+                // attachment part as message/rfc822 (#1488026)
+                else if ($mail_part->mimetype == 'message/rfc822') {
+                    $this->parse_structure($mail_part);
+                }
             }
 
             // if this was a related part try to resolve references
diff --git a/program/include/rcube_plugin_api.php b/program/include/rcube_plugin_api.php
index cfba7fa78..0e38a3101 100644
--- a/program/include/rcube_plugin_api.php
+++ b/program/include/rcube_plugin_api.php
@@ -176,7 +176,7 @@ class rcube_plugin_api
         if (is_subclass_of($plugin, 'rcube_plugin')) {
           // ... task, request type and framed mode
           if ((!$plugin->task || preg_match('/^('.$plugin->task.')$/i', $rcmail->task))
-              && (!$plugin->noajax || is_a($rcmail->output, 'rcube_template'))
+              && (!$plugin->noajax || (is_object($rcmail->output) && is_a($rcmail->output, 'rcube_template')))
               && (!$plugin->noframe || empty($_REQUEST['_framed']))
           ) {
             $plugin->init();
diff --git a/program/js/app.js b/program/js/app.js
index bbb14e7ad..149736107 100644
--- a/program/js/app.js
+++ b/program/js/app.js
@@ -40,11 +40,6 @@ function rcube_webmail()
 
   this.identifier_expr = new RegExp('[^0-9a-z\-_]', 'gi');
 
-  // mimetypes supported by the browser (default settings)
-  this.mimetypes = new Array('text/plain', 'text/html', 'text/xml',
-    'image/jpeg', 'image/gif', 'image/png',
-    'application/x-javascript', 'application/pdf', 'application/x-shockwave-flash');
-
   // default environment vars
   this.env.keep_alive = 60;        // seconds
   this.env.request_timeout = 180;  // seconds
@@ -90,12 +85,15 @@ function rcube_webmail()
     if (over) button_prop.over = over;
 
     this.buttons[command].push(button_prop);
+    
+    if (this.loaded)
+      init_button(command, button_prop);
   };
 
   // register a specific gui object
   this.gui_object = function(name, id)
   {
-    this.gui_objects[name] = id;
+    this.gui_objects[name] = this.loaded ? rcube_find_object(id) : id;
   };
 
   // register a container object
@@ -748,7 +746,7 @@ function rcube_webmail()
         var qstring = '_mbox='+urlencode(this.env.mailbox)+'&_uid='+this.env.uid+'&_part='+props.part;
 
         // open attachment in frame if it's of a supported mimetype
-        if (this.env.uid && props.mimetype && $.inArray(props.mimetype, this.mimetypes)>=0) {
+        if (this.env.uid && props.mimetype && this.env.mimetypes && $.inArray(props.mimetype, this.env.mimetypes)>=0) {
           if (props.mimetype == 'text/html')
             qstring += '&_safe=1';
           this.attachment_win = window.open(this.env.comm_path+'&_action=get&'+qstring+'&_frame=1', 'rcubemailattachment');
@@ -3505,7 +3503,7 @@ function rcube_webmail()
 
       case 27:  // escape
         this.ksearch_hide();
-        break;
+        return;
 
       case 37:  // left
       case 39:  // right
@@ -4914,6 +4912,34 @@ function rcube_webmail()
   /*********           GUI functionality           *********/
   /*********************************************************/
 
+  var init_button = function(cmd, prop)
+  {
+    var elm = document.getElementById(prop.id);
+    if (!elm)
+      return;
+
+    var preload = false;
+    if (prop.type == 'image') {
+      elm = elm.parentNode;
+      preload = true;
+    }
+
+    elm._command = cmd;
+    elm._id = prop.id;
+    if (prop.sel) {
+      elm.onmousedown = function(e){ return rcmail.button_sel(this._command, this._id); };
+      elm.onmouseup = function(e){ return rcmail.button_out(this._command, this._id); };
+      if (preload)
+        new Image().src = prop.sel;
+    }
+    if (prop.over) {
+      elm.onmouseover = function(e){ return rcmail.button_over(this._command, this._id); };
+      elm.onmouseout = function(e){ return rcmail.button_out(this._command, this._id); };
+      if (preload)
+        new Image().src = prop.over;
+    }
+  };
+
   // enable/disable buttons for page shifting
   this.set_page_buttons = function()
   {
@@ -4929,31 +4955,7 @@ function rcube_webmail()
         continue;
 
       for (var i=0; i< this.buttons[cmd].length; i++) {
-        var prop = this.buttons[cmd][i];
-        var elm = document.getElementById(prop.id);
-        if (!elm)
-          continue;
-
-        var preload = false;
-        if (prop.type == 'image') {
-          elm = elm.parentNode;
-          preload = true;
-        }
-
-        elm._command = cmd;
-        elm._id = prop.id;
-        if (prop.sel) {
-          elm.onmousedown = function(e){ return rcmail.button_sel(this._command, this._id); };
-          elm.onmouseup = function(e){ return rcmail.button_out(this._command, this._id); };
-          if (preload)
-            new Image().src = prop.sel;
-        }
-        if (prop.over) {
-          elm.onmouseover = function(e){ return rcmail.button_over(this._command, this._id); };
-          elm.onmouseout = function(e){ return rcmail.button_out(this._command, this._id); };
-          if (preload)
-            new Image().src = prop.over;
-        }
+        init_button(cmd, this.buttons[cmd][i]);
       }
     }
   };
@@ -5566,7 +5568,7 @@ function rcube_webmail()
     var base = this.env.comm_path;
 
     // overwrite task name
-    if (query._action.match(/([a-z]+)\/([a-z-_]+)/)) {
+    if (query._action.match(/([a-z]+)\/([a-z-_.]+)/)) {
       query._action = RegExp.$2;
       base = base.replace(/\_task=[a-z]+/, '_task='+RegExp.$1);
     }
diff --git a/program/steps/mail/func.inc b/program/steps/mail/func.inc
index b04628fa4..0c19b661b 100644
--- a/program/steps/mail/func.inc
+++ b/program/steps/mail/func.inc
@@ -1448,7 +1448,7 @@ function rcmail_send_mdn($message, &$smtp_error)
 {
   global $RCMAIL, $IMAP;
 
-  if (!is_a($message, rcube_message))
+  if (!is_object($message) || !is_a($message, rcube_message))
     $message = new rcube_message($message);
 
   if ($message->headers->mdn_to && !$message->headers->mdn_sent &&
diff --git a/program/steps/mail/get.inc b/program/steps/mail/get.inc
index 9138554f7..4eccd287e 100644
--- a/program/steps/mail/get.inc
+++ b/program/steps/mail/get.inc
@@ -79,10 +79,23 @@ else if ($pid = get_input_value('_part', RCUBE_INPUT_GET)) {
     $ctype_secondary = strtolower($part->ctype_secondary);
     $mimetype = sprintf('%s/%s', $ctype_primary, $ctype_secondary);
 
+    // allow post-processing of the message body
+    $plugin = $RCMAIL->plugins->exec_hook('message_part_get',
+      array('id' => $part->mime_id, 'mimetype' => $mimetype, 'part' => $part, 'download' => !empty($_GET['_download'])));
+
+    if ($plugin['abort'])
+      exit;
+
+    // overwrite modified vars from plugin
+    $mimetype = $plugin['mimetype'];
+    list($ctype_primary, $ctype_secondary) = explode('/', $mimetype);
+    if ($plugin['body'])
+      $part->body = $plugin['body'];
+
     $browser = $RCMAIL->output->browser;
 
     // send download headers
-    if ($_GET['_download']) {
+    if ($plugin['download']) {
       header("Content-Type: application/octet-stream");
       if ($browser->ie)
         header("Content-Type: application/force-download");
@@ -97,7 +110,7 @@ else if ($pid = get_input_value('_part', RCUBE_INPUT_GET)) {
     }
 
     // deliver part content
-    if ($ctype_primary == 'text' && $ctype_secondary == 'html' && empty($_GET['_download'])) {
+    if ($ctype_primary == 'text' && $ctype_secondary == 'html' && empty($plugin['download'])) {
       // get part body if not available
       if (!$part->body)
         $part->body = $MESSAGE->get_part_content($part->mime_id);
@@ -119,7 +132,7 @@ else if ($pid = get_input_value('_part', RCUBE_INPUT_GET)) {
       else
         $filename = addcslashes($filename, '"');
 
-      $disposition = !empty($_GET['_download']) ? 'attachment' : 'inline';
+      $disposition = !empty($plugin['download']) ? 'attachment' : 'inline';
 
       header("Content-Disposition: $disposition; filename=\"$filename\"");
 
diff --git a/program/steps/mail/show.inc b/program/steps/mail/show.inc
index 3c2fa238e..1472a9e61 100644
--- a/program/steps/mail/show.inc
+++ b/program/steps/mail/show.inc
@@ -52,6 +52,10 @@ if ($uid = get_input_value('_uid', RCUBE_INPUT_GET)) {
   $OUTPUT->set_env('delimiter', $IMAP->get_hierarchy_delimiter());
   $OUTPUT->set_env('mailbox', $mbox_name);
 
+  // mimetypes supported by the browser (default settings)
+  $mimetypes = $RCMAIL->config->get('client_mimetypes', 'text/plain,text/html,text/xml,image/jpeg,image/gif,image/png,application/x-javascript,application/pdf,application/x-shockwave-flash');
+  $OUTPUT->set_env('mimetypes', is_string($mimetypes) ? explode(',', $mimetypes) : (array)$mimetypes);
+
   if ($CONFIG['trash_mbox'])
     $OUTPUT->set_env('trash_mailbox', $CONFIG['trash_mbox']);
   if ($CONFIG['flag_for_deletion'])
diff --git a/program/steps/settings/save_prefs.inc b/program/steps/settings/save_prefs.inc
index ac1cfb3d0..208874f5d 100644
--- a/program/steps/settings/save_prefs.inc
+++ b/program/steps/settings/save_prefs.inc
@@ -141,7 +141,7 @@ switch ($CURR_SECTION)
     if (isset($CONFIG['max_pagesize']) && ($a_user_prefs['pagesize'] > $CONFIG['max_pagesize']))
       $a_user_prefs['pagesize'] = (int) $CONFIG['max_pagesize'];
 
-    $a_user_prefs['timezone'] = $_SESSION['timezone'] = (string) $a_user_prefs['timezone'];
+    $a_user_prefs['timezone'] = (string) $a_user_prefs['timezone'];
 
   break;
   case 'mailbox':
diff --git a/skins/default/common.css b/skins/default/common.css
index 55d537cc4..f5b1d3de9 100644
--- a/skins/default/common.css
+++ b/skins/default/common.css
@@ -98,6 +98,13 @@ input.button:hover
   color: black;
 }
 
+input.button[disabled],
+input.button[disabled]:hover
+{
+  color: #aaa;
+  border-color: #ccc;
+}
+
 input.mainaction
 {
   font-weight: bold;