UBB.Developers Forums UBB.classic V6 Mod Questions Delete Times out

In one of my forums I have 25,000 + threads. If I try to delete/move a topic I have problems. If I try and delete a topic it deletes the corresponding HTML/CGI file but it still lists it in the thread listing, but when you click on it you get a page not found error.

So could it be timing out because there are so many files in that directory. Delete/Move works fine in all other forums.

Thanks