UPDATE: In case this helps someone else...

I upgraded back to windows 10, and started getting mouse issues (using an MX518 now) when I was on there. My DPI setting kept firing back to default...

Hi, have you been able to solve this issue at all? I've had this all the time on windows 10, and it's doing my nut in! I've noticed also in game my constant fire on there appears to be 'slow' as well...