I just tried reassigning buttons on my G MX518*. The actions are labelled "Primary Click", "Middle Click" and "Secondary Click" and keep the labels after reassignment, so it seems they've fixed that.
*which I purchased recently to replace my aging 2004 model MX510. It's actually the third time I've replaced that old workhorse, the tenacious little bastard keeps outliving its replacements. When I heard Logitech had reissued the classic MX series mouse shape with modern sensors I decided I had to try it out.
Biting the hand that feeds IT
