So whilst doing some moderating I was checking out this thread and for some reason I am unable to actually check page 6 of the thread (which contains only one post I believe). This problem happened before with the LPPH-style thread in Spamzilla. It's somewhat annoying.
edit: note; I've had to delete some posts just so I can check out this thread (so it'll return to page 5 instead of the problematic page 6)
It's happened with me before. Funnily enough, I believe there was only a single post on the last page, too. I had to wait for someone else to reply to the thread before I could see it.
Sometimes forums submit errors where a thread will show an extra page, that really shouldn't be there. Could this be the problem or are you positive that there are posts on this page you cannot see.