Nuendo phase scope

[bizarre]

Hi
Can anyone tell me why it is, that when you use the scope ( nuendo plug ) and you monitor through Nuendo - the scope goes to the buttom, if you don't monitor through Nuendo, it behaves and stays at zero. It doesn't matter if you actually have anything plugged in the input, doesn't matter if it's mono or stereo ( would be really odd if it only happened in mono *G* )
bizz
Should I mention that the situation I'm talkin' about is, when there's no signal through and Nuendo is stopped

[bizarre]

eeeh - now 24 hours later ... it suddenly behaves and stays at zero monitoring or not ... hhhmmm - random funcionality - hate it
bizz