Thanks, Alan.... I've done everything from changing the preferences in my computer and CamTwist. Do I need to add CH 2020 to my "Screen Recording" on the Security/Privacy Preferences? As for the camera needs, I need my camera to work in CH, Google Hangouts, FaceTime & Zoom. I can use my built-in camera, when I'm not on CH..... The funny thing is that it works on my friend's computer, but not on mine. FYI, he has OBS but he's not using it. Should I download OBS? Apologies... for all of these silly questions, I'm just pulling my hair out (over here), to get this to work.
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