Suddenly my zoom toggle, zoom + and - have stopped working.  I checked the controller assignments, key assignments, everything.  They won't work with either the keyboard (Z[]) or my X45 joystick.  All other controls mapped to the joystick are still working fine.  I have calibrated the joystick both in and out of windows and in AH.  Checking the joystick buttons in properties - they are all working correctly and show up when I press them.  In the controller assignments in AH, they light up when I select them, and I have the proper commands assigned to them . . . .
Any ideas what is wrong?