I'm on Joomla 1.5.22 and JComments had been working fine. But I noticed this morning that the display is all messed up; past comments are overlaying the new comment box (and the footer, too, on entries with enough comments):

I just tried upgrading from JC 2.1 to 2.2.0.2 but it didn't go away. What can I do??
Update: This is happening in both Firefox and Safari.
Thanks,
Brian