Reviewed the blog after the first failure. Didn't cover what I was seeing. I tried removing the ~/.kodi/ directory first. That didn't rebuild anything. Figured I was hosed and the kids were waiting to watch a movie.
Though I had disabled updates, but something turned them on about a week ago. I spend the last 5 days refusing, but the notification was extremely persistent. I never go into the settings, so don't know how it could have happened. The kids aren't allowed to touch the system or the remote. Wife says she didn't touch it either. Doubt either would have found a way to re-enable updates.
But staring at the updates means someone here changed something, right? Nothing automatic would have enabled them?
I wouldn't bother to support reverting. When something bad happens on this system, using dd and restoring the last-known-good version is a 30 min solution that generally works. I've had more issues with PlexBMC breaking than OSMC since I turned off updates last Sept. We are a plex house, but HATE the plex player. It blocks subtitles at pause, which is completely unacceptable. Plus plex doesn't like local media much. Kodi + Plex are really the best solution for our needs. TV + Movies + Music cataloged in Plex and everything else in Kodi using NFS access. Also, like to use Plex for remote viewing/listening when we travel (no plex account, just use an ssh-proxy to the house). Need plex for other, closed, playback systems so the transcoding of our recorded media gets handled for those limited devices. Oddly, the r-pi is able to handle pretty much anything in the native format unlike the Roku, Chromecast, and other cheap players.