Problem with video here too - madVR crashes on video including TV. Sometimes the video will start and run until I mouse to bring up the playback controls, other times is will not start, just get audio black screen and then the madVR crash message. Was working fine yesterday. Today I got both a windows 10 update and a JRiver update so could be one of them. I am using AMD video card.
Update: If I change to Red October Standard it is working, crashes are on HQ. No changes in settings from when it was working reliably.