I seem to be getting this message at random when I am browsing the forums, and no number of clickings or cache cleanings can make it go away. However, if I managed to get into a page, I can view the last page as well as the one I was on by replying to the topic. Nothing else will allow me to view it. Its been like this since this morning.
Seems to have finally cleared up... Like most forum issues, by quitting time :P