I have exactly the same thing while using Rhino on a WIN7 64Bit Pro version. Just happened to me today while rotating my item and pushing either the ctrl or esc button.
Have been using it for 1 year now without any problems.
And also with me it copied the functions of the 1,2 3,4 buttons. Identical what Giersh wrote:
Anytime I press my ALT button, it tries to use button 4, and hits Transition also
CTRL opens a websearch, and I don't even know what button that is
ESC opens 3DC properties, a number pad and decreases sensitivity
Shift opens a new web browser window and increases sensitivity
Not happy since it really slows me down.
Very strange indeed.
So it is not due to connecting it to a Mac since I don't have one, nor do I have Sketchup.
I reset my profile to defualt, no change either.
I looked for an update and found that I was not running the latest version. So I updated, but without any positive result.
Release version after update is 3.15.2, Driver version 6.15.2, firmware version 4.11
I'm open for suggestions although I will try the trick with pushing the 1 and 2 buttons.