I keep getting the error 500 when I try to log in and check My Subscriptions....HELP!!!
Try deleting your browser's cache, and all cookies associated with the forums. In Safari, go to any page that's not the Apple Discussions and choose "Empty Cache..." from the "Safari" menu. Then, open Safari's Preferences, choose the "Security" icon in the toolbar, then the "Show Cookies" button. Search for "discussions.apple.com" and select all the cookies and delete them. Once I did that, I was able to see my "My Subscriptions" page.
However, I should probably mention that I didn't have to do that to get Safari to work, but Camino, which is the browser I use most. But when I wasn't having problems with Safari, I figured it might be a cache or cookie problem.
charlie