Thunderbird Unified inbox resets to no folders selected often.

I switched to thunderbird recently and have been having an issue with the unified inbox. I set it so that sent and inbox are included in my "Inbox" in the unified view, and I have two email accounts added. this is nice as it lets me have threaded view that includes my responses which I like. buuuuut. whenever I close thunderbird and reopen it, the unified inbox folder ends up resetting to 0 folders chosen. I tried only selecting the inbox folders and leaving out sent thinking maybe there was a conflict with the sent unified folder, but it still breaks.