Avatar collision problem

Dear Forum,

I am having problems with getting collisions working properly with my avatar.

Below is a video showing my set up and the collisions not working. The “floating” cube is used to demonstrate that the collisions between the cube and the table work.

Link to video

The left hand is being tracked by a camera and as you can see from the video the hand goes thru the table. I have used the PHaT editor to put collision spheres on the left arm and have enabled all the collision related options but with no luck.

Can anyone give me any pointers?

Many thanks in advance,

Peter