Hi WombatEd, if you open up the site.master and edit the line that has EnablePartialRendering="true" and change it to false the real error will show up [:)]
Dynamic DataEnablePartialRendering
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Re: PageRequestManagerServerErrorException: Specified cast is not valid.
Jan 28, 2010 03:19 AM|sjnaughton|LINK
Hi WombatEd, if you open up the site.master and edit the line that has EnablePartialRendering="true" and change it to false the real error will show up [:)]
Dynamic Data EnablePartialRendering
Always seeking an elegant solution.