I just installed the Decklink software, tried different versions. I push the video input "on" button in the Catalyst, seems to work, but if I try to turn it off again or change a video input setting it goes tumbling down... Crashes like any app in Os X crashes, with a message and an option to tell Apple...

Will update some software tommorow and see if it helps.

Which QT version is recommended with a Catalyst 3.3.2 h25(?), 6 or 7?

Thanks again!