Hello George,
I’ve exactly the same problem with the last driver of BM Decklink.
8.5.2.
I’ve already opened a ticket at BM support. But they told me that they don’t have premiere CS6 yet to reproduce this issue.
Looks a bit strange to me.
Anyway to overcome this issue you can install the driver 8.5 this works fine for HD footaged, but when playing SD footage like DV-PAL you will see that the output image is horizontally squeezed.
So a bit frustrating for the moment.
I’ve also noticed that with the driver 8.5.2 the multicam output image is very sluggish. It looks like a low resolution image.
I’m working with a Windows PC. Please can you test the multicam on your MAC. To see if you have the same problem?
Looking foreward to your answer.
Peter