HelloFirst, I want to say to the PMDG team "BRAVO" and congratulations for a fantastic MD11 Simulator. It was worth the long wait. I am thourougly enjoying flying it across the globe.The only problem I have is that MD11 cannot handle sim rate of 2 at all. One has to do that once in a while over long long stretches of water or deserts. After a minute or two, the aircraft begins to oscilate up and down slowly and then it becomes violent and nauseating. going back to 1x it stabilizes.In one flight, I was interrupted to do something so I put the sim at 1/2x until I come back. When I returned the aircraft was doing loops and completely lost control. I could not recover and lost the flight.I know this issue was touched upon briefly. It only happens in MD11. I never experienced it in PMDG 744/737, LDS or else.Thank you for any inputBill Hagag

1/2x is not supported. Stated somewhere in the manual. Don't remember where.I'm using 8x on all flights and that works fine.Alex

If you are not smoothing the weather with FSUIPC4 registered version then time acceleration will not work. I have not had a problem with x2-x4 and x8 usually works okay for long straight stretches.