Hey everyone - we’ve been working feverishly on this and we’ve identified the likely suspect. We’ll keep you updated on this thread when we’re closer to a resolution.
Please continue to report the Windows OS version, GPU card model & graphics driver as in the first post above. All of your reports have helped a great deal to identify what’s happening.
Also - if you’re an iOS / AppleTV user with similar symptoms - please weigh in on this other discussion. Thanks.