Could you go to System > Information in the NVR's main menu to see what firmware version you are on? We only need the first 3 digits of that version. Also on your local interface does the behavior change based on what split you are looking at? For example if the split shows 8 cameras at a time or when you go full screen. This changes what stream is being accessed from the camera and can give us a clue as to which is not working correctly.
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