Why would that fix it? The rig is almost certainly already symmetrical. You don't reverse the sense of +ve rotations on opposite sides of the body for symmetry, you change the sign of the value. It's not a rigging problem. It's a master channel on each tentacle that applies in a consistent rotational sense, +ve gives a positive z rotation on all child actors, which is what is seen in the posted image. There is nothing to tell Poser that a master channel on an actor on one side needs a sign change to give a symmetric appearance when applied to a master channel on the opposite side, especially if the channel on all actors is called SideSideAll. How is Poser supposed to know just from the name that, like zrot and yrot channels, left/right symmetry requires a sign change on the opposite side of the body. Unless Poser analyses master channels to see whether they ultimately control actor rotation channels with signed symmetry, it cannot apply symmetry to such channels.

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