Getting this error just after release to prod. Its a simple .NET 3.5 app without any web farms etc... this thread suggests the following solution is to update your web.config as following..
<pages validaterequest="false" enableeventvalidation="false" viewstateencryptionmode="Never">
</pages>
Thread title is
Validation of viewstate MAC failed / The state information is invalid for this page and might be corrupted
Thread link is
http://forums.asp.net/t/955145.aspx
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