KS7 slow shortcut response

[human_bean]

Platform / OS - KS7 on Mac OS 10.12.6
KeyShot version - 7.0.456
Modeling system, including version - Rhino 5 for Mac

I'm having issues where KS7 won't recognize my shortcut input (Shift + RMB/LMB for copy/paste, Alt + Command + RMB for Select Target, for example) when my input is 'too quick'.  Deliberately slowing down my input stops this from happening, but I did not experience this problem in KS6.

Is anyone else experiencing similar behavior?