This started yesterday. When I try to watch live TV or recorded TV, I get audio, but black/blank video.

I did the normal updates with a reboot, but nothing other than that (i.e. no config changes).

This is a frontend (10.10) that has the black video problem, but the backend/frontend (10.10) plays video just fine.

Youtube plays back ok and so does VLC.

Could someone help me troubleshoot this?