I see exactly the same thing so I don't think you're doing anything wrong. It's inconsistent, though. Sometimes the IVS screen works, and sometimes it doesn't. Just now, the IVS screen didn't come up. I went to abnormality, then IVS started working. One thing I noticed is that the camera is often in "slow mode", where the response anywhere in settings takes a while. When the IVS screen works, the response is snappy. My NVR started doing the same thing, even though I changed nothing since it worked ok. The camera firmware is 2.640.0000002.0.R.