Gordon Shumway wrote:

In my case, using OE, I occasionally reset each folder (to dump old
messages), then reload the newest 300, then compact all folders (to tidy
up
the dbx files). After doing that, any replies to a message I nolonger
have
will appear as a thread with "".

I don't use OE (Agent), but do you think the issue with posts no
longer appearing could have anything to do with "I occasionally reset
each folder (to dump old messages), then reload the newest 300?"

Yes, of course, that's what I said.