Recently, either starting with 1.28 or 1.29, my button assignments do not work at a fresh boot of my mac. I have to open Logi Options+, select a button, change its assignment from my choice to something else and back to my choice for it to work. This applies both to buttons, and to my chosen scroll mode (standard, I hate 'natural' scroll on a mouse). It seems that the mouse just uses defaults until I have re-configured my choices in Options+.