Go to your
Control Panel -> Database Tools -> SQL Commands tab and try each of the following commands:
REPAIR TABLE ubbt_FORUMS
REPAIR TABLE ubbt_TOPICS
REPAIR TABLE ubbt_POSTS
The last one will probably take a while since it's probably the largest table. Re-check your trouble-some topics then.
Done it... (with the right table pre-fix), but still the same.
If I try to move posts from topic A to topic B, the post remains in topic A, and a new subject is created in topic B, but if you click on B, there is no posts....
any other ideas?