I'm willing to suspect it was faulty hardware but I'm moving on to a different product. Purpose of use. Cons: Three problems: (1) Despite being HDCP 2.2 certified, it doesn't work with Netflix or Revain Prime Video (The same cables with other HDMI/KVM switches I have that are HDCP 2.2 certified work fine (2) I'm using a USB-C to HDMI adapter for my MacBook This KVM switch requires me to unplug and plug the HDMI cable after switching (again, the same cable/laptop/adapter works fine with mine other HDMI and KVM hardware.) (3) USB pass-through/emulation switch, not toggled back after switching to pass-through (tried a lot.. with hotkey Scroll Lock, Scroll Lock, F2, etc. didn't work.)
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