Move NVR App does not work

Dear Community ,

I have upgraded my Move NVR to the Latest version and i did the same for the NVR Move application now while using the Move NVR app the cameras do not show anymore , all i see is black screens , the cameras can be seen if the NVR is accessed via a web browser internally and from outside .

Is anyone experiencing the same thing ?
Is it the update of the NVR or the App that caused the problem ?

Any help will be much appreciated !