I've finally had a chance to sort out various studio thingies, and have been working with the Artist Series Mix all day using 64-bit Windows 10, and 64-bit SONAR Platinum. My experience is basically the same as Synaptic.
I'm going to work with it a while more and write up a full report of what works, what doesn't work, and what sorta works for next week's Friday's Tip of the Week. Meanwhile, make sure you have the latest version of EuCon control (3.4.1) and that you've updated the firmware. It's working fine here with Windows 10; for Ethernet, I've been going into a switcher and it's been reliable/stable.
I will say this is one of those situations where I thought things weren't working, so I poked around and tried a bunch of different and lo and behold, everything worked. Remember that it does take some time for the controller to recognize your system.
More to come next week, but not sure I can offer any specific advice on how to get it working with SONAR Platinum.