John,

I have had the same problem in the past. I would say that about 1 out of every 50 posts I make just disappears. I too think that it's probably because I thought I had submitted the post, but I was just really looking at the preview. However, I am not certain. Regardless, it is very frustrating when you spend a long time writing a reply, post it, then when you check back again later realize that it isn't there.

John