Forum Polls replacing each other
 

I've been working on a forum for a customer of mine, and he's been having a problem with new polls replacing old ones. As soon as anyone starts a new poll, it replaces other polls on the site. We've tried upgrading to vB4.0 and that did not fix the problem. I believe the problem may have started when the last web guy upgraded to 4.0 a while back, freaked out, and then went back to 3.8.5. I have no idea how he went about it, but since then the polls have not worked! I've tried shutting down all the plugins and even using a stock template and it does nothing.

Any ideas on how I can repair this? Has anyone else ever come across this problem?