In the Preferences folder there are some peculiarly-named folders, all of which are empty.
$¨w‰è“c
4ó‰èrb
ç‰èrb (3 of these)
îë‰èrb (2 of these)
ú¨‰èrb (3 of these)
I mention these in case they are a source of odd behaviour.
That is hard drive directory corruption. Run disk utility and verify the disk. There may be actual data damage that cannot be repaired without a reinstall.
I ran two verifications, the Partition Map and the Volume but both came up with "appears to be OK".
Could those oddball folders be some frick and frack from a previously unadvisable installation that's since been removed?
Could the two "appears to be okay" results be because I did a DiskWarrior directory rebuild about a week ago?