Interesting. What system config do you have? We talked to Blackmagic and they said 99% work fine, only a few of us are having these problmes, I am thinking it could be hardware/bios related.
Same problem with 5.3.1. We are using a dual xeon 3.4 with Hyperthreading, supermicro X6DH8-Xg2 motherboard, nvidea fx3400, decklink HD Pro 4:4:4. Anyone with similiar config?
The only driver we can get to install is 5.1.1. any info is appreciated