[Kieran Matthew] ” I ask because I know there are issues when you try to digitise SDI video if the audio inputs are set to AES but there’s no feed attached, or if you try to digitise SDI video but analogue audio (I think that right – Floh?) “
If the audio inputs are turned on but there is no digital signal you can get into trouble (there is no analog audio in on HDx). Is the box next to the V-toggle in the acquire window yellow? If yes, the system for some reason does not detect a valid video signal.