Posted 14 May 2010
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I had an issue with captcha generating an error when clicking 'Generate new Image'.
With help from the guys at Telerik, we traced it to a .Net issue with URL rewriting and postbacks.
If you are using .Net35 or later you can simply add
formName.Action = Request.RawUrl;
to the page_Load event
Anyone still using earlier .Net versions will have a slightly bumpier journey, though there are solutions out there.