Just discovered a rather nasty error in my Spacenavigator macro.
Basically, this was causing it to output -1, rather than 0 for all values, if a SpaceNavigator wasn’t plugged-in. Not good.
I forgot that the raw value from the SpaceNavigator HID patch outputs values in the 0 > 1 range (with 0.5 obviously being at the centre of the range), so it should be defaulting to sending out 0.5 to all outputs, if a SpaceNavigator isn’t detected.

Anyway, I’ve fixed the problem, and posted a new version in the Box.net widget. Apologies to anyone who might have downloaded and been confused by the old one.