I just came back and found my post had been moved back to Main. I began answering comments on it, and then suddenly it went away. It appears to have been deleted. My post, and all comments on it, are gone, without anyone contacting me about it.

Wow. This is a serious problem. Moving to discussion is one thing. But full deletion for what seems to be no particular reason is... not what I usually expect here.

I am taking from this comment that it wasn't you (Phil) who moved the comment back to main?

EDIT: Ahh, I see you have answered. A bug ('quirk') of the post edit page caused an accidental move which was interpreted as insubordination and punished in retaliation.