How to disable Select Media Source popup

[PureLoneWolf 3]

Hi all

I have Next Gen installed on 4 CoreElec boxes and on one of them, every time I try to play something the "Select Media Source" popup appears and presents me with 2 duplicate files to choose from.  Selecting either one plays normally.

I only have 1 file on the server for what it is offering 2 for and it is only happening on one of the boxes.  

I assume I have enabled a setting somewhere, but can't remember/find it

Thanks

[PureLoneWolf 3]

nvm - Something must have gone wrong with the original sync - I reset the local DB and resync'd - Everything seems OK now.