Today I was indeed able to get to the bottom of and fix the bug that had stumped me the other day.

Rest of the day was taken up by catching up to some bug requests and suggestions for v6 mode. Like making unlock and lock work for files that are not locally present. And, improving the behavior of the clean filter so it remembers what backend was used for a file before and continues using that same backend.

About ready to make a release, but IIRC there's one remaining test suite failure on FAT.