I am running vBulletin 2.3.3. I set my news forums to be forum #5 and forum #7. I found what appears to be a bug in the hack. I allow unregistered guests to post in forums 5 and 7. When they reply to a post in forum 5, it is their post that appears on the index page rather than the first post of the thread. If a registered member replies in the thread, it works okay. Also, when unregistered guests reply in forum 7, it appears properly.
So the bug specifically only affects the threads in one of my two news forums, and only happens when guests reply in the threads.
The actual details of how I got both forums working is written in
post #1879.