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Well, this is a new one on me and it definitely sounds database related, but let's see if we can narrow this down some...
What Forum module are you using?
What version of XOOPS are you using?
What is your PHP debug (Errors only please) output when you view your forum?
What is your MySQL debug (Errors only please) output when you view your forum?
Have you checked the database structure for the forum tables (thinks like default value)?
What changed between the time when everything was working and when it stopped working correctly?
Does anyone, but you have access to your site's database?
Has your hosting provider made any changes to MySQL lately?
Hope these questions get you started in the right direction.
James
Insanity can be defined as "doing the same thing over and over and expecting different results."
Stupidity is not a crime. Therefore, you are free to go.