Many months ago I reported this error/bug but it remains unresolved, even though it was supposedly progressed to Mozilla. I have a desktop PC & a laptop. The problem only occurs on the laptop. I am running T/bird on ESR channel on both machines. On the laptop, even though the settings are not to update automatically it does, reverting to the release channel. This displays the following bug! Instead of a "Junk" and a "Spam" fold I get 2 "Spam" folders, but a closer look shows the paths as being correct, what you would expect. The folder will not rename. Reinstalling the ESR version restores the correct folder names - UNTIL THE NEXT TIME THE PROGRAM AUTO-UPDATES when it shouldn't!