Ah, got it.  This is definitely a BIOS related issue.  
Legacy USB Support - Try setting this to Disable and retest.  If that doesn't work, see if moving the wheel and keyboard to different ports helps.  If you are using a hub, remove it and connect directly to the boards ports.  Not a whole lot you can do in this situation if the ports remain powered after shutdown.  BIOS downgrade is another possible solution since you stated an earlier rev worked previously.