fix for The state information is invalid for this page and might be corrupted Error

This error suggests that  the Viewstate information between postback are not same after first postback so when you click on a page's any server control , it will give this error.
Problem :You might have embedded a page which contains "runat= "server"  within a Masterpage.
For example f you have a placed jquery tabs in master page and jquery tabs pointing to an aspx page with

  attribute it will give this error.
Workaround:
Just remove "runat=server" from
tag in calling page .It will fix the error.