Decklink removed the functionality from the card to work as a regular audio card on the system in version 10 of the software, so if the application does not have a written plugin to talk to the card directly, it will not work. here is a link of their forums about it. It is ridiculous..... this will affect Windows users only by the way.
Blackmagic Forum • View topic - Decklink Studio 4K Win 7 - No desktop audio!