I've been having some problems with deformities whilst posing the limbs on my T. rex model. The problem occurs on the thigh and all of the arm bones.
Whenever I rotate the left thigh bone it causes areas of the mesh on the right side of the model to distort and follow the bone.
Leg angled to side
Rotating left arm joint distorts right
This happens with the arms and clavicle bones. The bones are mirrored and both thigh bones are parented to the pelvis bone in between and slightly to the front.
Any help would be greatly appreciated as this problem has troubled us for weeks.