There seems to be a bug that makes any comments sometimes appear, and sometimes not appear. I’m not having much luck tracking down the bug. Might be some kind of caching bug. My apologies.
It does seem that if you are logged on to the site, you will see the comments, and if you are not logged on, you might see them, you might see only some of them, or you might not see any comments at all. So if you really want to see comments, please log on (you can set up an account and don’t even have to supply an email address).
UPDATE: I might have fixed the problem (at least it appears to be fixed to me). So if you don’t see the comments, please let me know at firstname.lastname@example.org
UPDATE 2: I haven’t heard any complaints, so I’m assuming everything is ok again.