I did spot the Bugzilla report you refer to there, but unfortunately their suggestion workaround of calling
frameDocument.designMode = 'on'
on the control load event does not seem to working for me when applied to any of the document / window objects returned by the radEditor client-side API. As I am indeed using an earlier version of RadControls AJAX to the one you mention, I was wondering if anybody had successfully found a workaround to the bug - for example, as also indicated in the Bugzilla report, I too can use an alert box to defeat the bug, but I really don't want to use an alert box every time I show the editor control, it looks very clumsy. Has anybody found a more sophisticated solution? Does the success of the focus after the alert box indicate a timing issue, or a z-index issue, for example.
Thanks if anyone can advise.