[Milhouse]

Until tonight, now XBMC won't start after a reboot.

I get this error (or something similar, the text shows for a very short duration!) when Openelec is loading:

Code:

failed to setup user config dir
Check systemctl status userconfig.service

This would suggest your /storage filesystem is no longer readable/writeable. Reformat the /storage partition and restore a backup, or if you don't have a backup then you'll have to go through the setup process again.