At first it was a minor annoyance; For some reason any program that I double click that is within a fence, the UAC always appeared snapped to the right side of my main monitor. Okay, not that big of a deal.
Now comes the Win10 Anniversary Update. Now the UAC appears snapped to the left side of my SECOND monitor.
I can confirm that this ONLY happens with apps that I try and start as admin that are within a fence. Starting an app via Start menu or from an explorer window does not reproduce this result.