Erm. This sucks. Not the hack, of course, but the fact that (this being the first hack I've installed in about a year) I did everything perfectly, but when I got to the final step, I noticed that my forumdisplay_loggedinusers contains ONLY the following:
All right. Halfway through posting this, I realized that I was looking at "forumDISPLAY" not "forumHOME". Haha, I guess we newbie webmasters have got to make a mistake here and there. Just thought I'd post this for humor's sake at my blatant idiocy.