Hi, Did you encounter this issue? Just upgraded the Surface Pro 3 to Windows 10 before the free upgrade deadline. The upgrade went thru fine but he pen is not working. I can only double click on the purple button twice to launch the Note program but I can't use the pen as a mouse at all. I installed all the Windows 10 updates that's available and I tried remove the pen and pair the pen Bluetooth connection again but the problem persists. Is this a driver issue?