I just got a second Nuendo system with the HDSPe MADI card. I was running some tests and there were random pops/clicks recorded on the audio files. I did not have any MADI I/O connected to the card. I had the card set to be the master clock source and I was listening out of the headphone out on the card. Is this expected behavior to get clock errors if you have no MADI stream plugged into the card?

The system is an i7 quad, Windows Vista 64, 6gb RAM, Nuendo 4.3.

Thanks