Not only unnatural, but very very painful :) I must admit I've never seen quite this effect before. Are you just moving the shoulder (via the dials)? Do you have "Limits" turned on? It looks very much to me as though you're twisting the shoulder and not moving the collar at all - and "use limits" isn't turned on Paul

Are you moving the arm through an IK control? If so the IK sucks at forcing twists, which is what the collar needs. You'll have to manually put in a twist yourself. I usually twist 50% up if I know the arm is going to be raised, then IK from there. If you try and IK all the way from the side you'll get some odd collar effects.

heya; i believe you want to move the collar, which will move the collar bone, scapula, and deltoid area around. what poser/zygote call the 'shoulder' is really the upper arm. dont let this confuse you. ;)

Try this......turn IK off on right arm. Then zero the collar, shoulder, forearm and hand parameters for the right side. Then reposition the arm by sections starting with the right collar. Use small settings evenly on each body part until the arm is where you want it. This should fix the breaking problem. What's happening is you have one body part's parameters set too extreme and the others aren't set at all or very little. Remember that when you move your arm in real life that your collar, shoulder, forearm, and hand each move in conjunction.......good luck...... Krel