In the map view in FS-9, you can change the heading and the little AC graphic would trun to correspond to the new heading.
However, in FSX when changing the heading, the AC graphic does not change to reflect it.
It does change when you hit the OK button but, then you can only see it for a fraction of a second which is totally worthless.
If this is a bug, it only seves to again illustrate just how superficially it was BETA tested.