Trying to place my local folders directly in my mac os user directory as a mounted, encrypted drive, with the rest of Thunderbird under the Library subdirectory. Looking in this directory (mounted gocryptfs) shows the expected files. When I first open Thunderbird, there's nothing in local folders. The account setting for local folders indicates /Users/me/Mail. Nothing showing in Local Folders. I select browse, and again choose /Users/me/Mail directory. Still nothing showing in Local Folders. I close Thunderbird, then reopen Thunderbird. Local Folders now there and showing all expected files. So there's your work-around, but why isn't Thunderbird just opening Local Folders as expected ? Ownership and permissions on directories seem the same as on all my other accounts. David