I tried reinstalling FSUIPC with no extras, but unfortunately the stutters are still there when FSUIPC is running. During the first flight I didn’t really see it and thought it was the solution, but when I tried a second flight in the Cessna Caravan at another airport in New Zealand (latest WU and SU12 Beta), I could still see that rhythmic stutter when looking to either side. It’s definitely there, at least for me.