Hello. I know I am not the first one complaining about getting an "error500". In fact, after using the search I found loads of similar topics. So I think you already know the problem. It all started a week ago when I visited this site after a few months brake. Every time I try to open an instructable, I mean the tutorial, I get that error. It looks like this: http://img511.imageshack.us/img511/221/capturen.jpg Also, I get that error whenever I try to open a topic in the forum. So I can't even view them to find out how to remove the problem! I am using windows7, firefox 3.5.5. No, this is not a cookie issue, yes, I've tried other browsers. I also tried it on another pc (running on xp) And I also got those errors. However, only in the forum. I could open the instructibles, no problem with that. So, please someone help! I think this is really a major problem, because there are more users who experience the same thing. Thank you in advance. n3xas.