What versions of X-Plane are you running. If not the latest, Update to the latest and see if it works. Also make sure you have the option "Start with engines running" ticked under the "Operations and Warnings" drop-down menu. What happens then? Do they work. What system are you using. It is no more hungry than the Mu-2 or Javelin (from memory) We build planes presuming you have atleast a 256mb card. Im running a 7600GS nVidia and my frame rates aren't that bad. Sorry for the trouble your having with this plane. We hope to have these issues your having, resolved soon. Cheers, Theo