TV and Movies Library not working after July update

Well, this post sounds very similiar

Further more

Well it seems you haven’t understood the context of the shared database. All Kodi versions have to be identical for using the shared database. As with this update there was a major Kodi change you need to have them all on the same version.
Read: http://kodi.wiki/view/MySQL/Upgrading

So recommend:

  1. Update both OSMC devices (and any other Kodi device you use)
  2. After that check if it works. If not check MYSQL if the new databases already have been created dump them (make a backup first) they will then be recreated
  3. As general with the Kodi MYSQL setup ensure that the kodi mysql user has full rigthts (not only for the current database but in general)