Worked fine last night. Gotta love that BS.
Turned it on, Found the folder, selected the movie and nothing. Just a blank black screen.
Checked the drive: OK. Appeared on my computer and could play files from it.
Checked HDMI cable and video feed from HT to TV unit. Good.
USB cable works as it shows folders on TV from the WDMC.
Displays screen saver after a while too.
There is a green flash when I turn on the WDMC, that I’ve never noticed before, on the screen of the TV.