is anyone else unable to view page 7 of this thread?
(edit: And now that I posted this I can view page 7, before i kept on bouncing me back to 6 when I tried... weird)
There is a certain feature provided by vBulletin as part of the administrative tool set that we (mods&admins) have to employ every now and then. Unfortunately, even though this feature is provided by vBulletin out of the box, it ends up affecting some thread page numbering intermittently (showing more page numbers than the actual posts/pages you can actually see every now and then). It's out of our hands, since we are merely using a default, out-of-the-box vBulletin feature.
Perhaps it's better implemented in more recent versions of vB, but buying an upgrade just to fix a page numbering issue that usually resolves itself is a non-starter.
So suffice it to say, what you're seeing is a vBulletin thing, a side effect of a feature that they provide out of the box (not a 3rd party plugin).
Anyhoo, carry on