I was just about to post something about this if it wasn't already here. My computer has been down for about a week and a half, and just finished a reinstall and found this problem using Opera. Firefox loads the site fine, but I'd prefer to use Opera. I can load the last (most recent) page of a thread, but trying to go back doesn't work. I've been using my Wii during the time for some browsing and had the same problem. I had hoped/thought it was just a problem with the Wii. Too low of memory or some such making it unable to load everything under the new format. I don't know who if any of the others who are having the problem have PMed ioi, so I'm going to do that now.
For Gnizmo, if they have the same issue as mine, they will still be able to read the newest page, so you wont make the thread completely unviewable for them.