I am back, hale and hearty (well, hale at least, to some extent...). In the comments below, Gunnar alerted me to the fact that long comments seem to get chopped off arbitrarily and without warning. I am looking into this, but for now the bug still exists. My apologies.

UPDATE: I don't seem to be able to duplicate the problem. I've posted some really long comments (and deleted them again) as a test, but it seems to work fine. I'll keep testing.