Thanks to Lisa at Musings of a Procrastinator Extraordinaire for figuring out a way to let me know I had my comments set so nobody but me could leave one. You'd think after screwing up who-knows-how-many online credit card purchases, I'd learn that you have to click back on the main screen after choosing something from a drop-down menu or risk the drop-down menu randomly changing your choice, but obviously that lesson hasn't stuck in the brain yet. Sheesh.
I've fixed it now. ;-)