My 4216P NVR has, for the past few years, displayed all 10 cameras (stream S1) on the monitor. But recently one of the camera windows is blank unless I switch the stream to Main. I've fiddled with lots of settings but I'm at a loss to the reason why. I'm sure it's something sinmple. Any suggestions how I get that one camera to start displaying back on stream S1 again? All other cameras continue to work fine.
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