Dispose a RadEditor with AJAX (ASP UpdatePanel, RadAjaxpanel, RadAjaxManager) and if you attempt to show a floating toolbar (i.e. all ToolbarMode options except Default and RibbonBar) a JS error is thrown.
There are two workarounds:
1) use ASP UpdatePanel with ChildrenAsTriggers=false and updateMode=Conditional
2) override several RadWindow methods to prevent the error (these scripts must be placed just before the closing </form> tag):
	<script type="text/javascript">
		Telerik.Web.UI.RadWindow.prototype._moveElementToShowOutOfView = function ()
		{
			if (this.view)
				this.view.moveOutOfSight();
		}

		Telerik.Web.UI.RadWindow.prototype.setVisible = function (toShow)
		{
			if (this.view)
			{
				if (toShow)
					this.view.show();
				else
					this.view.hide();
			}
		}
	</script>

Code for test:
<ol>
    <li>test
    <ol>
        <li>test </li>
    </ol>
    </li>
</ol>

1. Go to the end of the nested list and press 'Enter' twice

2. The nested list is discontinued but by pressing Enter the parent list can not be discontinued.

When ContentAreaMode='Div', hovering over a select HTML element causes the contenteditable property to gets value 'false' in Firefox

After editing the properties of a hyperlink in Chrome the link just disappears. See the video at http://screenr.com/XxX7 which demonstrates the issue occurring on the demo site.