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Slaves not moving is usually due to the slaves being unable to find a location to click. This is especially common when the server and client don't agree on the location of a mob, or in places where the terrain is cluttered or uneven {awnings, posts, boxes in the way} and the camera angle doesn't allow the slaves to target and click properly. Simply moving a few paces is usually enough to fix this.
Your camera angle is probably leaving your slaves with obstructed camera angles since they're basically under the dummy and trying to "click" on the arms, weapons, shields, other toons, whatever is in the way, because they can't "see" the ground.