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It may not have anything to do with that arm, it may be a case of geometry flipping on another arm or the trunk, (my suspicion) and thus causing the rig to flip on the number 10 arm. It's also possible to flip the orientation on a rig if you duplicate it with symmetry so that the duplicated chain does the opposite of the original as far as manipulation goes.
If the geometry were completely at the mercy of the rig, (which it is without IK on) then you'd be able to take any old Poser figure and flip the whole thing inside out. The IK is there to keep the rig and geometry intact by simulating joint behavior under normal physical rules, I.E. not being able to bend your elbow backwards beyond a certain point etc.. If you do bend the elbow backwards and "flip it", you may get unpredictable results. Anyway, if you can get C6 I reccomend it, that way you can animate each arm independant of the others and blend it all. I can help you get started with that easily enough if you like.
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