Pads + Screen Blank on Project

[Machines]

Playback controls, prefs, etc. still function, but on one project the pads and screen have gone dark – not allowing me to control a MIDI track at all. In Arrange mode. Everything works as expected on a new project – just happening on this one file.

[Machines]

Ok - well, the old "unplug it and wait 30 seconds" did the trick. Would still like to know why, but back in action for now...lol