Under firefox a request for the stylesheet is made but it is never received.

Currently, the following workaround resolves the issue:

           if ($telerik.isFirefox) {
               setTimeout(function(){
                       sender.onParentNodeChanged()
                       }, 500);
           } else {
               sender.onParentNodeChanged();
           }

Currently the default font of RadEditor in Chrome is set to "Times New Roman". This font, however, is not set to the text. 

When a table of any size is inserted in RadEditor, the user's cursor is placed in the beginning of the document and is, thus, scrolled to the top.

The issue appears in all versions of Internet Explorer in which the Document Mode is set to IE7 and IE8.

The same behavior is observed when pasting content in a table.

When a custom font is used in the RadEditor and the cursor is positioned on text that uses this font, the font name that is displayed in the Font Name dropdown will not be correct under IE.

Steps to reproduce:
1.Type some text in the content of the editor;
2.Press Accept All Track Changes button;
3.Type some other text between two words of the previous text;
4.Press Accept All Track Changes button;

When a text with formatting is pasted in the content of RadEditor with 'EnableComments' property set to 'true' under IE, the formatting will be stripped.

When the AutoResizeHeight property of Editor is set to True, pressing enter resizes the content area without reaching the bottom of the content area. The bug can only be reproduced in IE9 and IE10.

video: http://screencast.com/t/3mCkQNTC

If a RadEditor is placed in an UpdatePanel and it is initially invisible (its property 'Visible' is set to false), the skins of the dialogs will not be loaded correctly when the editor is displayed ('Visible' is set to true).

Whenever there are texts and text boxes, checking the spelling duplicates the text 
Video reproduction: http://screencast.com/t/oShyk0ww

Adding some initial, plain text (no HTML <p> tag wraps the text) and e.g., bolding the last word, pressing enter after it removes a white space.

The easiest workaround is changing the NewLineMode property to Br.
Example:

   <telerik:RadEditor runat="server" ID="RadEditor1" NewLineMode="Br">
   </telerik:RadEditor>


More complex solution that will enable you continue using the paragraphs as new lines is by incorporating the following JavaScript code:

   <telerik:RadEditor runat="server" ID="RadEditor1">
   </telerik:RadEditor>

   <script type="text/javascript">
       Telerik.Web.UI.Editor.Utils.trimWhitespaceTextNodes = function () {

       };
   </script>

Note that the script should be put right after the RadEditor declaration to ensure that the RadEditor scripts are loaded.

Here is the simplest sample we have managed to isolate this issue to: 

        <iframe id="Iframe1" runat="server" src="http://bing.com"></iframe>
        <telerik:RadEditor ID="RadEditor1" runat="server">
        </telerik:RadEditor>

1. Run this code in Chrome

2. Click anywhere on the page except for the iframe.

Please check the attached workaround (chrome_editor_iframe_workaround.js) and add the script to the end of the page.

An official fix will be available in the Q3 2014 release.

The scenario is related to RadEditor working with content providers. When inserting an image in chrome through Image Manager, the default width and height are applied to the HTML. The behavior is observed only in Chrome browser.

When there is some bold text in the content and teh backspace is used to delete it, the browser crashes. 

The problem stems from the new implementation of the inline commands. To resolve this you can roll back to the default browser behavior as described in the following help article:
http://www.telerik.com/help/aspnet-ajax/editor-inline-and-block-commands-behavior-change.html

If the user insert an Iframe in the Html mode of RadEditor,  switch to Design mode and then switch back to Html mode, the HTML content becomes non-editable. The issue is reproducible in Chrome.

Possible workaround:
Use the RadEditor control in Div content mode:
http://demos.telerik.com/aspnet-ajax/editor/examples/contentareamodediv/defaultcs.aspx

A workaround is to set the table element's height as well:

<telerik:RadEditor runat="server" ID="RadEditor1" Height="400">
</telerik:RadEditor>

<telerik:RadButton runat="server" ID="RadBtn1" AutoPostBack="false" 
    Text="Change Size" OnClientClicked="changeEditorSize"></telerik:RadButton>  

<script type="text/javascript">
    function changeEditorSize(sender, args) {
        var editor = $find("<%= RadEditor1.ClientID %>");
        var width = editor.get_element().style.width;
        editor.setSize(width, "200px");
        //this line is the workaround
        editor.get_mainTable().style.height = "200px";
    }
</script>