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Validation of viewstate MAC failed. If
this application is hosted by a Web
Farm or cluster, ensure that
configuration specifies
the same validationKey and validation
algorithm. AutoGenerate cannot be used
in a cluster.
I have tried disabling viewstate on main page and on the thickbox.
This is happening when clicking an asp.net button on a query ui pop up box.
Trying to redirect back to the main page.
I had disabled the EnableViewState, but not the EnableViewStateMac field.
All sorted thanks for the help mate.
Berty