I upgraded my NVR to latest firmware, v3.3.0.226_23031644, to be able to handle my new camera and I get the impression that it is buggy.
First of all: I am not able to connect it using an iPad anymore.
The display, mouse driven, keyboard is not working well. I have a difficult password containing both upper and lower case letters, symbols and digits, which now is difficult to enter because the [Aa](?) button hides the keyboard instead of shifting and have to do multiple clicks to get it up again and you never know if you get the uppercase, lowercase or numeric keyboard up again (BTW: Is there really a need for the numeric keyboard at all?)

My favorite is of course my latest, a RLC-811A.