Once i load this plane for flight ,engines running. Try to advance throttle forward, engines do not speed up. My FPS dropped from 40 FPS to 2-3 FPS. The computer is starting to hang up. Once i return throttle to 0, the FPS start to return to normal FPS. I have a Saitek X52 PRO. If i use my mouse to operate throttle. This seems to work. Could there be a conflict between my Saitek X52 Pro config and Xp11 controller config settings. I have tried various config combinations and settings without positive results. I have also found out that every plane that i own, requires different config setting to function properly. My system is a MacPro Tower 2.7Ghs x 2 Amd Radeon 7950 3072 MB