Kerbal Space Program

If you assign a joystick axis to any of the EVA Pitch/Yaw/Roll axes, the jetpack becomes broken, even for keyboard input.

Specifically:

I have a joystick which works well with KSP for staging.. (MS Precision 2 - a basic joystick with no special drivers). All keyboard assignments left at default. A fresh install of KSP (from Steam). No mods.

Assign twist to Yaw OR an axis to Pitch (and probably the same for Roll).
The following occurs:
The Q and E keys become inoperative
Moving the joystick axis produces the appropriate visual firing of jets, but there is NO FUEL CONSUMED, and it has no effect on the Kerbal. WASD lshift and lctrl work fine, consuming fuel and affecting the Kerbal.