Since some weeks Rhino5 64bit doesn’t recognize rightclicks from Wacom devices any more on my machine. All other software, including Grasshopper and Rhino5 32bit, recognizes Wacom-rightclicks.
Sometimes I’m using the Gemvision-Matrix 7.5 plugin. When I’m opening a 3dm-file written by Matrix7.5 (even an empty file), Rhino loads V-Ray for Matrix. Then it recognizes Wacom-rightclicks.