If you are flying the GreyHawk with manual controls, your FPS is below 60 and you enable time acceleration, it will start to wobble.
It has been reproduced in both Stratis and Altis with the only difference that the Obj VD in Stratis had to be upped for my FPS to drop below 60.
This has been tested only with the GreyHawk.
1.In editor, put a UAV Operator and a GreyHawk in the airfield in Altis or Stratis.
2.Connect to UAV terminal and take UAV controls.
3.Take off and set the GreyHawk to fly across the island.
4.Use external view and set your graphics settings so that they drop below 60, use Vsync. Enable freelook and tilt your view a little for the island to be visible and affect your FPS.
5.If you enable time acceleration after a few secs the GreyHawk will start to wobble.
6.Disable time acceleration and it will stabilize.
Using Beta Dev.0.77.109525
Youtube video showcasing the bug:
https://www.youtube.com/watch?v=nA7l0TY86h8
Time acceleration is enabled and disabled 2 times in the video
BIS Forums:
http://forums.bistudio.com/showthread.php?162482-Greyhawk-wobbling-when-time-accelerated-and-below-60-FPS
PC specs:
http://www.overclock.net/lists/display/view/id/4203491