You might have been looking at the site when I was in the middle of updating something. I'm not getting any error on the #TEMPVAR page now.
As far as the image overlay issue, I haven't decided what to do about that yet, if anything. I hated the fact in the old forums that posting a huge image or code dump would cause the entire forum to resize, making every other reply to the topic really wide. If I can figure out how to make the individual forum topic body area scroll, then I might add that. At least you've given me a good test post to play with ;)
I'm not sure if it's by design but the forums itself does get oversized (which is good). I didn't see any scroll bars on the image though, even after I shrank my browser.
I didhate the huge images, but I like large monitors and lots of screen real estate. It's part of why I rarely posted images.
You might need to clear your browser cache. The scrollbars appear in both Firefox and Chrome for me here. The forum should not get resized. This site has a max_width that should prevent it from getting unreadable. Yes, unfortunate for people with large monitors, but making a post really wide really does make it much less readable.