The Next (or Prev) button/link could be improved to avoid the following situation
Let's say you are browsing a Forum and are on 1st page. The threads are ordered
by the default orderring by last post.
Let's say it takes a minute or two to took at the thread titles in the first page,
then you click "Next" button to go to second page. Then many thread which again appear on the second page, cause some other threads were posted to and have now moved to 1st page.

Could the "Next" button remember when the 1st page was looked at and present the next page as it was when the 1st page was displayed. This way we won't miss any threads/see same threads again on several pages. :look:

That would be relatively difficult to do for each user.

As an alternative, however, you may sort by thread start date, rather than post start date, which should give you a better order, and hopefully work out for you.

The controls for this are on the bottom of the forum page