[Eric Black]

I finally did the intelligent thing and called AJA support. Putting the answer here, in case anyone else ends up with the same problem.

The sadly easy result to this problem is to open the AJA Control Panel and in Control under Default Output click on the Video Output dropdown. It is most likely on Test Pattern. That alone might fix the problem. I actually changed it to another selection and then back to Test Pattern, but the support tech said just clicking on it would probably do it.