Im using RageSpline and have an object moving around using GetAxis(). The object has a rigidbody, but will not collide with the box colliders for the boundaries of the scene. I have tried multiple ways to get this to work, but nothing is happening. The rigidbodies work fine for static objects, but not the one Im moving around.
I had the same problem.
Try making the object collider a trigger and use this code instead 
`
function OnTriggerEnter(other : collider)
{
}
function OnTriggerStay(other : collider)
{
}
function OnTriggerExit(other : collider)
{
}`
Hope this helped good luck