Are you using dmame, mame, or mame32?
if a command line version are you adding the right "switch" to enable wingman warrior support?
I haven't tried WW in a while in MAME, but will be shortly again for mounting on my control panel for my cabinet...
I thought I stumbled on a message somewhere in the archives here that different versions of the LES software treat the spinner differently... *shrug* sorry can't be of more help, at the moment...
but if you let us know which version of MAME you are using, adn your OS maybe we oculd help more... also which port you are using, the serial or the gameport... uhm... so yeah... let us know.. and then I can go home and try and see if I have a simliar problem...
Have you tried it with regular games (not MAME, some generic FPS or something? )
rampy