[@Mahz]

[s]One more thing; hidden user posts also still appear in profile history.[/s]

EDIT: It appears that when a post is hidden, new posts that should go to the new page end up doing so without telling the forum to signal to the user to go to a new page. I.e. Posts appear on a page you're locked out of going to until you post something yourself and bump visible posts onto that new page.

In other words: Hidden post -> next post should go to new page -> new post goes to a new page but new page isn't accessible due to hidden post changing the internal page count -> stuck on last page until posts catch up to what the server expects.