I recently updated my Thunderbird client to the release update channel, at the recommendation of the Thunderbird team. Huge mistake to follow that recommendation. If you haven't done it yet, don't!! Among the problems I've had so far are:
1. My messages are now displayed in card mode instead of table mode.
2. The list of recent folders for saving email messages has been deleted.
3. The message list panel frequently goes blank for no apparent reason, so there's no list of my emails in my Inbox or any folder.
I'm very disappointed in the release update channel and plan to switch back to the way it was, at least until all of those bugs are worked out.
