Your searchindex table is corrupted. Upload repair.php (it's in the 'extras' folder of the zip file) to your admin directory. Close your forums, then run it from your browser with this syntax:
http://www.yourdomain.com/forum/admin/repair.php?html=1&check=1
[Of course change the exact URL as appropriate for your forums.]
If everything reports 'Ok' then reopen your forums. If not, then run it again. The second time everything should report Ok (except the session table which you can ignore.) See if this fixes the problem.
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