Have you changed the agent in the library advanced settings?
That is, ON THE LEFT NAVIGATION COLUMN, when you edit the library by clicking on the 3 dots next to the TV Show library >goto EDIT > ADVANCED and check if agent is The Moie Database. Also, pls cross check if in the player settings 'Play Theme Music" is selected.
If all is okay with the above - the only bthing that i can think of is to try and delete that particular Show from the library and then do the following:
These functions can be found accessing the 3 dots menu next to "LIBRARIES" in the left navigation column:
1) Optimise Database
2) Clean Bundles
3) Empty Trash
Shutdown NVIDIA Shield.
Remove the Power Cable
Remove any ethernet cables if any.
Wait for about 5 mins and reconnect wireds and turn on Shield.
After Home screen comes on - pls wait for at least 10 mins before you do anything.
Now access PMS and add the show again and see if it works.