I see that is unfortunate lol. It is definitely one of those things that once notice drives you crazy. I think you are probably right though. I do have one last test I can do to put your theory to test. I can run my Nes/Snes through the ossc and into my hdmi to component converter box and then try outputting from the system to my shinybow scart to component converter and see if it gets tearing in both of those or only one of those situations. I will report back, and thank you.
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