I have a weird problem when using Seated Mode in the Xna Example of the Kinect for Windows Developer Toolkit 1.5.1.
The only thing I add to the code is flowing line.
this.Sensor.SkeletonStream.TrackingMode = SkeletonTrackingMode.Seated;

Did anybody tried using XNA and Seated Mode without having this Problem?
This looks like the XNA sample tries to draw all joints. Since only a limited set of joints is available in seated mode, the remaining joints are drawn at a default position.