I'm not sure when this started occurring since there have been a few major updates on both the VM Fusion and Windows side of things, but recently I've found that "3rd Mouse Button" (aka Scroll Wheel click) is extremely intermittent. I use this button a lot in AutoCAD to pan around drawings, and lately it seems like there is nothing but headaches.
Some interesting facts:
- this happens MORE frequently if I have the "Virtual Machine Library" window minimized
- if I have the Virtual Machine Library window maximized, it still happens but LESS frequently
- Previous assumption was wrong - does not matter if VML window is minimized or maximized
- Control-Mouse3 never has an issue. Only Mouse3 by itself.
- no other mouse functions seem odd
- Took USB drivers down to USB 1.1, removed any USB 3.0 speciality drivers from Windows (no change)
Operating Environment:
- macOS Sierra, 10.12.6
- Windows 10 Pro
- VM Fusion 8.5.8