I did the clean install, but the Popup Menu option still doesn't show up in the 3Dconnexion Properties Button Configuration tab for my applications. The applications I'm using are Rhino 3d and 3d Coat. I have a SpaceNavigator.
This is the driver I downloaded and installed: DxSoftware64_v3-15-2_r1219.exe
Here's a picture to help clarify: