Thanks for the tip!
I just installed newer Decklink drivers so it trashed all of those settings, let’s see if it helps.
Thing is it works with a DV sequence, I am only seeing this with uncompressed 8 bit (only one I tried). And not with all effects. Seems like Apple are going strong on having DV, HDV et al to work fine but kind of forgets about uncompressed users. At least that is the feeling I get. Or it’s Black Magics drivers that don’t really cut it.
Maybe it’s time to try out a kona card. 🙂