Hmm, this is really wierd.
Is it a big forum you have there? (live)
Do you have a backup file from last week?
If you do, install a 3.6.5 test board on your PC, then import the backup into it.
Next do a backup, using MySQL Administrator. (test board)
Then do a backup, using the MySQL Administrator. (live board)
Use a compare tool like Araxis Merge or something similar and compare both files, you will see at least if the tables are not broken and if there are any anomalies in there.
There is something corrupted inside your live data.. we need to find out what.
EDIT: Make sure you dont have any cache enabled, like APC, etc.
If you do, disable it for now.
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