Hi
Great program! Long time user.
Since sometime the behaviour has changed when updating my movies “data sources” when my NAS drive is not logged in [disconnected]
In that case my whole database gets cleared out [wiped] and I am presented with empty movie database … 
When I log into the NAS [connect] and choose ” update data sources” then my database gets filled again.
Solution:
the database should NOT be wiped when trying to scan a disconnected source path…
-of course , I might be doing something silly…. 