Now using 2012, and still experiencing this problem, it has never really gone away. While I don't have a cure for this problem yet, I do have a solution that works well. In all my dynamic blocks I put a Visibility option into it, whether I need it or not. Then I create a Blank visibility into it. In this Blank visibility I turn all objects and parameters off. When I experience the duplicating problem, I go to the Blank visibility and delete all objects that are visible, because the duplicated objects show up in all visibilities. This is, by far, easier than selecting objects one by one and hoping they are not the original objects connected to the actions. Note; the visibility and the base point do not turn off, so make sure you don't delete them.
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