Hello everyone, i've got a problem with my Logitech M510. When a user A is logged, user B can't use extra buttons and scroll wheel. When user A get unlogged, user B recover the mouse fully functionnal. No solution for me, latest drivers installed many many times, not solved. I've got a MS Sidewinder X4 Keyb, but extra buttons doesn't work at anytime, it seems it's a MS W8 problem. Thanks