After I released Firestone South, a few users reported an issue where the player was at a 90 degree angle to the ball. This only happens when the ball is outside of any splines that I've drawn. After doing some investigation tonight, I'm pretty sure the "Move the Ground" tool caused the issue. When I went to a backup copy of the course before I used the "Move the Ground" tool, the lake issue came back but the sideways golfer issue was gone. I'll update this thread again when I know more.
Might be that when you moved the ground one or more of the shotpoints didn't snap to the new height value - might be worth checking as I can't account for it otherwise.