The site underwent an upgrade on Tuesday night and there appear to still be some glitches to work out. Most of us can see all the forums and threads. Here's something you could try: clear your cache and history, close your browser, and go back into your browser. See if that works.
If it doesn't, post here again and I'll alert the tech folks to your problem.
If it doesn't, post here again and I'll alert the tech folks to your problem.