When I try to moderate a thread, I select "approve" then click "save" at the bottom and it says something like "Moderated threads successfully" - then refreshes back to the threads needing moderation and they are still there! This happens regardless of approve or delete - they just get "ignored" and put back into the queue.
SOME of them (normally at the very bottom of the queue) can be moderated successfully but I almost always have to go into the actual forum and spot the post to approve or delete it or not.