When I try to use Auto IK to move the lamp, it works fine except the “Lamp Shade Joint” (along with all of the attached objects: shade, bulb, etc.) stays behind. It actually appears to be attached to the stem as it will rotate. I have no idea how it got this way, and I have no idea how to undo it.
My lamp also appears to have acquired an extra bone (attached to the lower arm) which I cannot make go away. I don’t know if this is related or not.