Check your settings.
Clipboard>Options>Controls>Map Keys: Select View>Scroll down to Zoom Toggle should be Key_Z by default.
Clipboard>Options>Controls>Map Controllers: Look at the Mode Selection, is it on Mode 1? Is the Auto Select checked or not (that would explain the GV's working)? Has the desired button on the joystick been assigned to the Zoom Toggle function in the current/default mode?