I am using the parent constraint to move object_A from the floor to the back of a shelf. Object_A gets picked up by object_B and then is set on a shelf and then moved to the back of the shelf by object_C. I have set up the parent constraint by selecting the floor, object_B, object_C and then object_A and then selecting the parent constraint rollout.
When I animate the weights of object_A from the floor to object_B so that the constraint lets go of the floor and constrains to object_B for moving up to the shelf, object_A translates on axis X.
Can you see anything I am doing wrong? I am doing this exactly as the help file says to do it as far as I can tell. I am using Maya 6.