Very strange vbulletin issue (vbulletin.com won't help cause it's hacked)

[SeanThomps]

Hey guys,

I am having some weird issues on my site, http://www.volconvo.com. A user pointed out to me that when he tries to copy a paragraph from this site: http://www.buzzmachine.com/archives/...15.html#008481, and pastes it into the quick reply box and presses "go advanced" or "post quick reply" he gets a 500 error. I tried this as well, and the same thing happens for me.

Also, the same error happens when I go into my admincp and go into style manager. If I try to save anything (edit templettes, styles, etc) I get the very same 500 errror, and cannot save.

This problem is very recent. I removed my most recent hacks to see if that was the problem, and it's still the same.

EDIT This problem happens even in the regular reply area. If I paste anything copied from that page mentioned above into the reply box I get that error. I tried the same thing from another page...I copied text from cnn.com and it worked ...wtf is going on..and why can't I save in my admincp style manager