[enoreckeephi]

another bump ... I still cant work this out ... its a mystery. I bought a brand new android box, fresh install of Kodi and it scanned the library perfectly. Refresh - same problem. 

can someone please please help ?

Try to make sure the Kodi app is stopped, and that the Kodi settings folder is really removed on the Android tv box:
\\192.168.x.x\internal\Android\data\org.xbmc.kodi\files\.kodi

Android tv on nVidia Shield can share the internal memory as a folder on the network so you can access it from a computer. It should be found in android storage settings.

I had a similar problem with the library after the update to 18.5 where when I scanned for new episodes, both new and old ones disappeared from the library.. the logs looked fine, found episodes and downloaded metadata but only the shows info were there saying "0 of 0 episodes watched", and I tried to remove and add source, but it didn't help. I finally removed MyVideos116.db in [i]\.kodi\userdata\Database[/i], after this the scanning worked fine.