I tried using the joint editor to put both the center and the end point in the center of the Primitive square, and also tried parenting the square to a ball Primitive and pointed it at the camera. Both of there worked to keep the face of the square pointed at the camera. However, in both cases, as the camera orbits the square, the square precesses; that is, it rotates around the line between the center and the camera...

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"Oh - the manual says that? I have never read the manual - this must be why."
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