That thread shows only 6 pages to me (it's says page 6 of 6, not page 6 of 7). Why do you think there are 7 pages to it? If you look in the database, how many posts in the thread and are they all 'visible'? Have you tried maintenance > general update tools > rebuild thread information?
There are 7 pages. It shows 6 on some but 7 on my side here. I have made posts to this thread and they are not showing up. Yet they are showing up just fine on other threads.
How does the rebuild thread tool work? I noticed you enter a number that will rebuild threads. Can you rebuild a specific thread there?
Thanks for the help as I am still learning the inner workings of vbulletin.