I am running 4979.06 on three and 4980.06 on one. I let MXM boot all the way to main menu, I then one controller after another, when MXM is fully loaded, I insert a memory card into the top slot of all four controllers, I then removed all four and inserted into bottom slots of all controllers, Debugger App still gives no info on them... I then pressed Up, Down, Left Right on D-Pad, ... Debuuger app shows that I made the button presses...
EDIT: There are no memory cards inserted when I start MXM up... and I tested this on all Four Xbox'