I have just purchased Vegas Edit after using Edius. (I notice the forums/official support only list "Vegas Pro" as a section).
I can see an output in Edius but not in Vegas Edit. The choice in Vegas Edit is "Decklink" rather than Intensity Pro 4K - but I think they are effectively the same thing.
I have set the output device in Preferences/Preview Device.
I wonder where I am going wrong. (I have power recycled the desktop but to no avail).