http://www.icyphoenix.com/viewtopic.php?f=35&t=6718&p=55352#p55352
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TheSteffen
Wed 07 Mar, 2012 09:52

Re: [SOLVED]   Website Went Blanco
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Sorry, I did not read everything...

If you have still this error, you can try to resync all your forums and categories.
Because this was the last thing you did. "Delete a forum"