Oops, the problem was on my end! Thanks for the feedback, pachy.

On my system (Win 98 SE) I get a choice of "large fonts" or "small fonts" for things like window titles and icons. I didn't think it affected text size in posts too. Using my old monitor, I had to switch to small in order to run certain programs. With the new monitor I thought I could just keep it on small but I see there's a downside.