Having updated my firmware (accidentally, through the mobile app...), I discovered that the new firmware had modified the sharing and public access settings of some of my shares (not happy about that). *
So I stupidly used the Dashboard to turn off media serving on two shares that don't have media on them (or, that I don't want media to be shared).
But I forgot that doing so causes the MyCloud to overwrite
/etc/contentdir, killing my nice, fine-grained media searching controls, and setting the search back to '
All Content Types'.
I found out when I tried to use a playlist, which refused to play, which led me to look at my library, and discover it was completely wrong.
It was interesting, having correcting the 'Sharing' control in the Twonky UI, to watch the content status count down, as it removed to old search tree from its database, and then ramp up again as it searched the new...
* Oh, and it set my access to my private share to 'none'. Not happy about that, either...