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AnswerRe: Email validation against database PinmvpRahul Rajat Singh6-Feb-13 21:59 
AnswerRe: Email validation against database PinmemberAnkur\m/7-Feb-13 1:50 
QuestionValidation of viewstate MAC failed for ASP.NET 4.0 application PinmemberMember 98165276-Feb-13 11:24 
AnswerRe: Validation of viewstate MAC failed for ASP.NET 4.0 application PinmentorKeith Barrow6-Feb-13 12:33 
First, just to check the simplest solution, you aren't posting back "old" pages are you? By this I mean getting the page when the viewstateEncryptionMode is off/auto, switching the mode to on then posting back. This wide cause the error, but is unlikely Tokyo are doing this.
 
This problem is ringing a bell, but I can't place my finger on it. You might be suffering from this http://blogs.msdn.com/b/tom/archive/2008/03/14/validation-of-viewstate-mac-failed-error.aspx (On my mobile so can't make clickety),though this was fixed IIRC.

AnswerRe: Validation of viewstate MAC failed for ASP.NET 4.0 application Pinmemberkarthickpradhaban11-Feb-13 4:46 
GeneralRe: Validation of viewstate MAC failed for ASP.NET 4.0 application Pinmembersmehta.er12-Feb-13 6:28 
GeneralRe: Validation of viewstate MAC failed for ASP.NET 4.0 application Pinmemberkarthickpradhaban13-Feb-13 5:24 
GeneralRe: Validation of viewstate MAC failed for ASP.NET 4.0 application Pinmembersmehta.er13-Feb-13 5:44 
GeneralRe: Validation of viewstate MAC failed for ASP.NET 4.0 application Pinmemberkarthickpradhaban13-Feb-13 5:45 
GeneralRe: Validation of viewstate MAC failed for ASP.NET 4.0 application Pinmembersmehta.er14-Feb-13 7:10 

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