Yes, I know that is an old thing, but it never worked for me. I used point to ground and the direction was not perpendicular in all positions. There is a gravity prop somewhere in the freestuff, it point to a virtual object well below the ground, but continue not working. I solved the problem when I set the "end point" of the junction with the joint editor and now is working. Setting the origen and direction is not enough!

Stupidity also evolves!