I am wondering about something...

I have had instances recently, on both the Airbus and the 737, that some programs come up on the PDE system and others don't.

On an Airbus flight, nothing worked (got an error) except for the Best of Guam

On a 737 flight, "Workaholic" did not work (any episode) but everything else worked. When "Workaholic" was selected, the screen goes black but nothing played.

I would have thought these are just files they load into the system and don't understand how some work while others don't. Would the system even monitor itself and report something is wrong/missing?

Thanks.