Here is a link that should help you sort out your problem
The cause of the problem is:
The Microsoft security update that security bulletin MS11-100 addresses changes the default maximum number of form keys, files, and JSON members that ASP.NET will accept in a request to 1,000. This change was made to address the Denial of Service vulnerability that the Microsoft security bulletin MS11-100 documents.
http://support.microsoft.com/kb/2661403[
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There is a fix in the link. Hope this helps
Thanks Storxstar