Specifically, it's because of my current layout. As I was told in the comments, IE 6 on the PC is no longer displaying the headings. All other browsers I test with (Safari, Camino, Firebird, IE 5.2 Mac) display everything correctly. I don't have IE 6 for Windows (I don't have Windows to begin with), but surely someone out there has one and knows what I can do to get IE to display it properly. I'd like to keep the layout as it is and preferably not have to use too many perverse CSS hacks. But of course IE users should still be able to read something here – I'm not trying to be that mean to them, even though they do have to use the devil's operating system.