It happens often. It's usually a problem in IE8 when an article is broken it breaks the rest of the page which includes the page navigation links.
MaxPC staff are aware that they have these problems but I doubt it will be permanently fixed anytime soon. They usually just fix the current issue and not the root of the problem. I also have not had any luck posting these issues on the forum. I don't think they look at these posts, but email them will get their attention.
What browser are you seeing this problem in?viewtopic.php?f=28&t=109376