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May 05, 2009 12:49 PM|LINK
I'm not actually getting a Yellow Screen. Originally I had Custom errors enabled in the web.config and the site was catching the exception.
Error: sys.WebForms.PageRequestManagerServerErrorException: Invalid postback or callback argument. Event validation is enabled using <pages enableEventValidation="true"/> in configuration or <%@ Page EnabledEventValidation="true" %> in a page. For security
purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them. If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register
the postback or callback data for validation.