This is happening to me too.
Possibly just a bunch of traffic...
I think the servers are getting overloaded. Everytime I refresh, there are 15 new posts. Maybe if we all limited the graphics (as funny as they are) it would help.
It's something to do with a glitch in the server caching system and a very busy posting day. The comments really are in the database and eventually they will show up in the thread and, hopefully, we will eventually get the gremlins worked out.