I'm a longtime user of Vegas - even prior to Sony's ownership, so I know my way around the preferences. My current problem is an inability to get Vegas Pro 14 to use my external monitor, while I can still access it using Vegas Pro 13, which I still have installed on my PC. Alt+F4 doesn't work and when I go to the Preview Device page in Preferences, I get access to the pulldown for the Windows Graphics card, but nothing else:

On Vegas 13, using the same access, I get the ability to make further selections, as shown here:

Anybody have a solution?