You aren't using the select subset button, are you? That will prevent the smart prop dialogue from popping up. And you did parent the prop to the figure after you imported it? Other than that, I don't know what could be going wrong. Not sure about the deformation thing, unless maybe the parent is scaled? I think that can confuse Poser because it isn't sure where to put the origin when it starts to convert the translation from the unparented version to the parented version.

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