http://www.leftunderground.com/admincp/ go in from here see the logs, you may run the maintenance see if that does it but i would ban that ip first thing
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yes more than likely something to do with vbseo , i dont use it maybe go to their site and ask for help also
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I cringe when i hear vbseo
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someone that knows database errors will be on soon hopefully, me i would do a restore and just ban the ip, the node error is wierd