Thank you for reporting the double page load problem. I are aware of this problem that appears in Firefox and
Chrome only and it is already fixed. The problem is fixed in the latest internal build
and it will not exist in the upcoming Q2 2009 beta build too.
To fix the problem in the current SP2 build, please set the new TableLayoutCssFile
property of RadEditor to point to some external css file (it could be empty), e.g.
<telerik:RadEditor runat="server" ID="RadEditor1" TableLayoutCssFile="~/Empty.css"
the Telerik team