Its the FF damping and friction setting. Set them to zero. Had the same om my momo. It has been mentioned elsewhere. Scared the crap out of me the first time as well. Now get driving.
I dont use the fullscreen setting. It does not mean the sim is not fill screen though. Confusing...yup, its italian i guess.
Not using it allows me to alt-tab out and back in. The setting is more a keep nkpro window on top setting.