please check A/V Device setting under Audio/Video Settings. proper video and audio device should be selected and mirroring should be checked off.
Also, on ETT window, there are small icons (easy to overlook) let you select which tracks be recorded (video, audio, t/c). The video icon looks like film (with perforation) and it gets yellowish when it’s on and gray if it’s off. If the video is off (in gray) then the video won’t be recorded on tape.
I’ve never had such problem, but I’m interested. please share with me if you find remedy for your problem.