T-Bird 68.2.1 (64-bit) on opensuse Linux 15.0 Leap For several weeks now -- On opening T-bird, I see "deleting folders" at the bottom left of screen. After deleting a crapload of folders, it starts downloading messages and I see this: -------------------------------------------------------------------------- The folder 'XXXXX" could not be found, so filter(s) associated with this folder will be disabled. Verify that the folder exists, and that filters point to a valid destination folder. -------------------------------------------------------------------------- The folders deleted are sub-folders of a sub-folder. As soon as I go to the "empty" sub-folder, it immediately displays the next (missing) level of subfolders. On going to each of the formerly "missing" subfolders, it immediately populates (downloads) its emails content, taking whatever time it takes to do so. After that, filters work as expected EXCEPT, of course every disabled filter must be manually re-enabled, a time-consuming operation especially since it must be repeated next time the program is started. Question: Since filters can't find them and are disabled, WHY are subfolders being deleted ? I know they are being deleted because T-bird tells me it's deleting them. I see this problem on this forum 8 years ago, then again 6 years ago. Seems to be back again....