It seems like half the time I try to post an answer on the green, it will show up saying it was successfully posted, then disappear. This isn't just in preview, it POSTs the comment and I get a full HTML page back with the new comment included. But if I look later, anytime between minutes and hours later, the comment's gone. It disappears from my posting history too, and I've gotten no mail from admins or anything like that. This doesn't seem to happen on the blue.