Half of the time after both engines are started only one will operate. The other appears to be stuck. The throttle moves but the engine does not throttle up and provide power. To really make me scratch my head when I put the engines to idle and turn on the reverses the stuck engine provides reverse thruster power normally. Resetting back to normal engine ops and try to thrust forward yields the same result; that engine is jammed and will not operate. It seems to depend on which engine is started first. The second engine is usually the one that fails to operate after they are spooled up and ready to go. This behavior is occuring in XP11 b12. I am sure it is because of the beta status of XP11. Is this a known issue with XP11? Any way to stop this from happening other than waiting for XP11 RTM and a compatibility patch on the IEXG 737?