5/26/2025: I'm a long time TBird user, currently running 138.0.2-1 on Arch Linux 6.14.6-arch1-1 and xfce 4.20.4-1. On 5/21/2025 my InBox began behaving strangely. After moving a message from InBox to another folder, TB announced that it was unable to compact InBox because it was read-only (which was obviously false). Various combinations of compacting InBox, stopping/starting TB, and rebooting the machine, seemed to work. On 5/23/2025 things escalated. TB would not show the body of any messages in the Preview window, usually after I moved or deleted a message. Opening a message would open the appropriate window, but not show the body content; Reply showed neither body nor To:. Restarting and compacting InBox did no good. Other folders seemed to behave normally. Taking the next step, I opened Properties for InBox and clicked Repair. The result was the disappearance of all my InBox messages back through 5/19/2025. Very irritating to lose several dozen messages. On into today (5/26/2025) TB has been pretty well behaved (though I did update from 138.0.1-1 on 5/25/2025 as a hopeful pre-emptive strike). Then I moved a message from InBox and the Preview window failed to reflect the body of the now-current message or any other InBox message. Again, other folders were fine. No improvement with Compact, so I tried Repair again. This time it deleted InBox messages back through 5/6/2025. I can restore from today's early a.m. backups, but have no idea how to reconcile with the current state of InBox. Obviously something is seriously wrong and I have no idea what to do. Meanwhile, I will deal with email clumsily on my phone. PLEASE HELP!! Thanks.