I just bought a brand new MM711 and I was loving it for about 10 minutes until I installed the software and firmware. Once that happened the LEDs turned off, scroll wheel stopped working, side buttons stopped working, and the DPI became locked at the highest setting. I know it isn't an issue with the computer/software because when I try the mouse on my other computer all the issues remain. I think I somehow may have put the mouse into demo mode, that's really the only logical explanation I can come up with. Any help is greatly appreciated!