OBS Studio, although I am by no means an expert in it, normally works pretty well for me. Occasionally I have to disable and re-enable a microphone or camera, or unplug and replug a microphone or camera, but OBS seems to be giving me a devil of a time in simply recording the full screen of my display 1 while I play a classic Sierra game in GOG Galaxy. The resultant video file (*.mov or *.mkv) is always only a few kilobytes and unplayable. OBS doesn't have a problem recording anything else I put on my screen. Does GOG Galaxy have some nefarious disabling that it does to prevent OBS from recording video of the screen, like the Netflix app on iPhones? :-x