Hi Christopher,
There are a number of Roon users (including myself) who are using Server 2012 R2 with AO. If any of them can assist then they will. Also if the devs know of something that might be the problem then they will help if they can.
There was discussion about UI scaling in this thread
Ultimately, however, Server 2012 R2 is not a supported OS and the devs simply aren’t in a position to track down and troubleshoot in the same way as they do with the supported OS’s.
The only thing I can think of is that this could be driver related. What sort of driver are you using for the Panasonic ?