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When I or any other user on any machine tries to change the navigation through Site Actions - Modify Navigation, an error occurs stating

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

This error occurs throughout the farm and has only been noticed since we applied the June CUs last week. I don't think this error occured prior to this, though can't be sure as chagning the navigation doesn't occur frequently.

I have however, been able to make an urgent change using the object model through Powershell directly on the MOSS server.

The ULS has an entry below

Process: w3wp.exe
Area: Windows SharePoint Services
Category: General
EventID: 8kh7
Level: High Message: (Error as recorded above)

I can't find any recurring messages surrounding this entry.

share|improve this question
Hi Mike, may I ask what would you like to ask? Base on the information above, I can see your observation and findings but could not find any question. May I assume that you wish to ask what caused the error? – Wilson Tan Sep 16 '11 at 7:52

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