Had an idea. The out the Mokin Hub I've been using at my desk for the past two years, with my MBPro & Samsung Monitor also 2 years old, worked fine before the update. And after the update power still went through it for the Mac and through the Usb ports, just no video. So I switched it out for the Anker hub I use for travel and it all works fine, including video. When I go back to the Mokin - no video.
DPro23
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