i'm working on the Mac OS 10.12.2 and Photoshop cc 2017
When i used photoshop cc 2016 or before, i can set some personal option for the physical button of the drawing tablet and use them on Photoshop. But now i can only use the pen pressure .
i think that it's not any problem with the drive of drawing tablet, because i can use and set the physical button on other programs such as Adobe Lightroom 2015.8.
by the way, my drawing tablet is from the Wacom
Please follow the solution documented in Menus, shortcuts, Lasso tool, or Photoshop stop working when using a Wacom tablet | Mac OS and also ensure that you have the updated driver for your tablet installed.