I also have the AWUS036ACM. When you plug it into the Mk 7, does the blue light on the adapter light up? If so, did you have to do anything special to get the Mk 7 to detect/enable the adapter? When I plug my Mk 7 into my Mk 7, the blue light doesn't come on like it does when I plug it into a Windows 10 machine.
Sorry of this is silly question, but I just got my Mk 7 yesterday and had ordered the AWUS036ACM to use with it, so I'm in the process of learning the most basic stuff right now.