PokerTracker

I migrated to a new Mac. Everything seems to be working fine except I can't right right click to get current session stats.

Do you have secondary click turned on in your Mouse settings? If you don't have that turned on that might be your problem. Apple Menu -> System Preferences -> Mouse to find those options.

Secondary click is turned on.
As far as I can tell right I can right click with my mouse regardless of whether that's on or off.

I am able to access current session stats by control/clicking the display.
I can't get it by right clicking.

Control+click is another method of secondary click built into OS X - if secondary clicking is turned off in the OS then it won't recognize right clicking at all.