It's up whenever I log on. Like Rasler said, it makes certain parts of the site's text bigger, and whenever I try to access the new posts, all I get is a blank screen with the message.
The file the error mentions is shared by both of them, so it's not Death of Blue.
I have no idea what the problem was, and didn't try to fix it because I couldn't find a good way to get to the line the error mentions without killing my brain, and also I know nothing about PHP. So unless Ash did something, the forum just hated something about you.