Last week I exchanged several messages with a person X through my account A. The day later, they disappeared from the inbox of the account A. The sent messages remained. When I search for the name of the sender in account A folder with QuickFilter, nothing comes up. When I search for the name of the sender from the Search box, the messages a found, but in account B. I can read them from the search results, but they are NOT in the inbox of account B. A total mystery, looks like crossed pointers.

This kind of thing happened before, a few months ago in one of previous incarnations of TB, but the messages came back a few days later, Not this time, even after a reboot.