Same boat. Saw it once after one of the reboots, but not after trying the steps of restoring my old server instance.
Once I shut it down, I have no option in Settings to turn PMS back on.
This was after getting the nVidia hotfix, sideloading the linked APK, and reformatting my USB to FAT32 and then NTFS (to see if the result was different).
Shield and Plex can see the USB stick and move the library, but the settings to turn the PMS back on are missing. I force stopped PMS and then after a reboot I was able to see the settings, but manually turning the PMS on didn’t do anything.
It appeared on the shield, but not in my Plex client on the web. When I rebooted next, the PMS settings were gone and still couldn’t find the Shield PMS on any of my clients.
