More strange behavior. I connect the keyboard to another PC (which has never had icue) and it works just fine. I can press m1,m2,m3, and the dimmer button and it works fine.
Plug it back into the original pc, and the keyboard lights up on 'm3'. Windows does not recognize the keyboard at all. Nothing happens when pressing m1,m2, m3, etc. Unplug and replug, same.
Did another soft reset, and it's back to the previous problem - working fine on m1 or m2, but press m3 or dimmer, and it's gone again.
Ugh..