The click event of the button is not prevented and the native anchor behavior occurs. This causes the page to scroll to the top and a # to appear in the URL. 

You can use the following code snippet to prevent the native click behavior of the anchor element and workaround the issue:

<telerik:RadEditor runat="server" ID="RE1" ToolbarMode="Floating" OnClientLoad="OnClientLoad"></telerik:RadEditor>

<script>
    function OnClientLoad(sender, args) {
        $telerik.$(".RadEditor a[title='Toggle Floating Toolbar']").attr("href", "javascript:void(0);")
    }
</script>

Using the Image Map Editor to create a mapped area over the entire image, causes the image to be unelectable. 

The floating toolbar window does not open when the user toggles to full screen.

You can resolve the issue by incorporating the following script block:

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

<script type="text/javascript">
    Telerik.Web.UI.Editor.DefaultToolAdapter.prototype._showToolbarHolder = function (isVisible) {
        var editor = this.get_editor();
        var toolbarEnum = Telerik.Web.UI.EditorToolbarMode;
        if (!isVisible) {
            if (this._toolbarHolder) this._toolbarHolder.hide(); //NEW - Add a check for the toolbar holder
            return;
        }
        
        //Hide if in fullscreen mode and toolbar is ShowOnFocus
        if (editor.isFullScreen() && editor.get_toolbarMode() === Telerik.Web.UI.EditorToolbarMode.ShowOnFocus ) return;

        //Hide previous wrapper and mark yourself as the wrapper
        var wrapper = Telerik.Web.UI.Editor.DefaultToolAdapter._visibleWrapper;

        //Return if you are already visible
        if (wrapper == this && wrapper._toolbarHolder && wrapper._toolbarHolder.isVisible())//NEW - toolbar holder might not be created!
        {
            //Activete it before returning, as it could have been deactivated after showing an editor dialog
            wrapper.get_toolbarHolder().setActive(true);
            return;
        }

        if (wrapper && wrapper._showToolbarHolder) wrapper._showToolbarHolder(false);
        Telerik.Web.UI.Editor.DefaultToolAdapter._visibleWrapper = this;

        //Create the holder in the last possible moment before showing
        this.get_window();

        //Do additional initialization depending on toolbar mode
        this._initNonDefaultToolbarMode();

        //Show toolbar hodler
        this._toolbarHolder.show();

        //IE, ShowOnFocus, PageTop: hide properly the fake toolbar parent here instead _moveToolbarsToEditor
        if ($telerik.isIE) {
            var toolbarMode = editor.get_toolbarMode();
            switch (toolbarMode) {
                case toolbarEnum.ShowOnFocus:
                case toolbarEnum.PageTop:
                    editor.get_TopZone().firstChild.style.display = "none";
                    break;
            }
        }
    };
</script>

When there are list items which are links, pressing enter to create new list item duplicates the previously created anchor.

The same issue applies when new lines are created with link inside.

Currently it is not possible to set the value of a password input in the content area of RadEditor via the Design view.

The Node Inspector module is not working when inspecting form elements that are inserted via the 'Insert Form Element' command in IE11.

When there is a need to open dialogs in browser's window instead of RadWindow, the UseClassicDialogs property is being used. With the release of Q2 2015 the functionality stopped working and throws JS error when a dialog is opened. 

To workaround this behavior you can apply the JS patch as shown below:  

    <telerik:RadEditor runat="server" ID="RadEditor1"></telerik:RadEditor>
    
    <script type="text/javascript">
        Telerik.Web.UI.RadDialogOpener.prototype._applyParameters = function (dialogName, container) {
            //If no parameters provided, return
            var parameters = this._getDialogParameters(dialogName);
            if (!parameters) return;
    
            var parametersUrlPart = "&dp=" + encodeURIComponent(parameters);
            var baseUrl = this._getBaseDialogUrl(dialogName);
            var totalUrlLength = baseUrl.length + parametersUrlPart.length;
    
            var parametersPassedFromClient = this._dialogParametersProviderTypeName == "";
            var parametersPassedThroughUrl = parametersPassedFromClient && totalUrlLength <= this.get_dialogUrlLengthLimit();
    
            if (parametersPassedThroughUrl) {
                //NEW: If the dialog features the same URL, do not reload it
                var curUrl = container.get_navigateUrl();
                var url = baseUrl + parametersUrlPart;
    
                if (curUrl != url) {
                    if (this.get_useClassicDialogs() || container.isCreated()) {
                        container.setUrl(url);
                    }
                    else {
                        container.set_navigateUrl(url);
                    }
                }
                else //Reinitialize
                {
                    var contentFrame = container.get_contentFrame();
                    if (contentFrame && contentFrame.contentWindow && contentFrame.contentWindow.$find) {
                        //TODO: Probably implement a global function initializeDialog that will be called automatically - easy for custom dialogs
                        var initDialog = contentFrame.contentWindow.initDialog;
                        if (initDialog) {
                            contentFrame.contentWindow.setTimeout(function () { initDialog(); }, 1);
                        }
                    }
                }
            }
            else {
                container.setUrl(baseUrl);
                container.DialogParameters = parameters;
            }
        };
    
    </script>

End-users cannot clear class or apply class of block elements (i.e., <p>, <div>, <h1>, etc.,) when a class name already exists. 

The content area size is exceeding RadEditor's height in IE11 with its default document mode "Edge". Currently the issue could be worked around by setting the following meta tag.

      <meta http-equiv="x-ua-compatible" content="IE=10">
The approach is described on the following article:

http://msdn.microsoft.com/en-us/library/ie/jj676915%28v=vs.85%29.aspx

When link is given to any image or text, Unlink command should get enabled. But it gets enabled for text only while remains disabled for images.
http://screencast.com/t/xHgru58pzKL

The issue has been reproducible since 2015 Q1 release

If the user creates a link with the first word in the editor and then decides to insert a new paragraph, even though the link is moved to the 2nd paragraph the same link is also created in the first paragraph.

The error causes the editor's content area not to render. 

The following script can be used as a temporary workaround:

<telerik:RadEditor runat="server" ID="RadEdior1" OnClientSelectionChange="OnClientSelectionChange">
</telerik:RadEditor>

<script type="text/javascript">
    function OnClientSelectionChange(editor, args) {
        if (!editor.getSelectedElement()) {
            editor.focusFirstText();
        }
    }
</script>

Subsequent showing of an Paste HTML dialogs updates the title with some delay. 

A possible workaround is using the code from this example:

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

<script type="text/javascript">
    function OnClientCommandExecuted(editor, args) {
        var command = args.get_commandName();
        var dialogContainer = editor.get_dialogOpener()._dialogContainers;
        var dialogName = "";


        switch (command) {
            case "PasteFromWord":
            case "PasteFromWordNoFontsNoSizes":
            case "PasteAsHtml":
                dialogName = "CleanPasteHtmlContent";
                break;
            default:
                break;
        }

        dialogContainer[dialogName].add_pageLoad(updateTitle);
        dialogContainer[dialogName].add_show(updateTitle);
    }

    function updateTitle(sender, args) {
        var clientParameters = sender.ClientParameters;

        if (clientParameters && clientParameters.dialogTitle)
            sender.set_title(clientParameters.dialogTitle)

        sender.add_pageLoad(updateTitle);
        sender.add_show(updateTitle);
    }
</script>

Handling the OnClientPasteHtml event of the editor cannot be used properly, because the logic cannot rely on the command name to further interact with pasted content.

For the time being you can use the following script to workaround the issue:

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

<script type="text/javascript">
	Telerik.Web.UI.Editor.CommandList.PastePlainTextWithTable = function (commandName, editor, args) {
		if (editor.get_lockFormatting && !editor.get_lockFormatting())
			return;

		if ($telerik.isIE) {
			var restorePoint = editor.createRestorePoint(),
				utils = Telerik.Web.UI.Editor.Utils,
				dirtyText = utils.getClipboardAsHtml(editor),
				cleanedText = utils.cleanPastedContent(dirtyText,
				editor.get_stripFormattingOptions(),
				editor.get_localization()["askwordcleaning"], false);

			restorePoint.select();
			editor.pasteHtml(cleanedText, args.get_commandName());
		}
	};
</script>

When pasting a list element in the editor via the pasteHtml method, the cursor is positioned in the beginning of the first possible list element. The expected behavior should be to be placed right after the last list item.

The scenario is very specific. It is reproducible only under IE11 when RadEditor is loaded in an iframe, in Div content area mode, with AutoResizeHeight="true" and Skin is set to MetroTouch or BlackMetroTouch

Deleting all content in editor (e.g.,  Ctrl+A and delete), and switching to HTML mode, an unwanted   is always present. Whereas, the content should be empty. 

If you set anchors in html content and additional put some HTML comments, under IE7 the hrefs will be placed as absolute.

For example the following HTML:

<div id="htmlcontent">
    <div>
        <!-- comment beginning -->
        <a href="/relativePath/ToALink">
            <img alt="" src="relativePath/ToMyImage/image.gif" />
        </a>
    </div>
    <!-- /another ending comment -->
</div>

Will be transformed to this one:

<DIV id=htmlcontent>
<DIV><!-- comment beginning --><A href="http://localhost:52771/relativePath/ToALink"><IMG alt="" src="http://localhost:52771/relativePath/ToMyImage/image.gif"> </A></DIV><!-- /another ending comment --></DIV>