I don't know if this has anything to do with the recent forum upgrade, but I was doing a search on the term "phpnuke" just now. I received a list of threads with that term in it, clicked on a thread with the title "phpnuke integration" and received an error that said "You are not authorized to view this page." However, when I go to the Mod Requests forum, find that thread and click on it from there, it works just fine.