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The security validation for this page is invalid

Posted By:      Posted Date: December 04, 2010    Points: 0   Category :SharePoint

I have SharePoint 2010 installed in a lab and have encountered an error:

"The security validation for this page is invalid. Click Back in your Web browser, refresh the page, and try your operation again."

This occurs when trying to modify a list's view in order to change a default sort order and possibly other properties on that list.  I read that one can disable validation in Central Admin > Web Applications > General Settings, and that although this is not recommended, it did allow me to save modifications to a view.  Unfortunately, switching security validation off causes the Silverlight popups that allow creating new document libraries, pages, etc no longer works.  The error is:

"Error, An unhandled exception occurred in the Silverlight Application"

There are no features, or other custom code running.  This is a plain install of SharePoint 2010.

This seems to be happening on the My Sites site collection.  When I am logged in as the farm admin, I don't receive this error.  But if I am logged in as normal user, who does have site ownership - full control - the error occurs.

My environment is configured like:

http://lab.contoso.com - Top level publishing site

http://lab.contoso.com/members/sites - My Sites (members is a managed

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