Odd. I have my V4 in one runtime and Dawn in another. Not even on the same physical drive, and haven't seen that error. But great that you got it working. AND found the culprit, in case others get that same error :)

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You just can't put the words "Poserites" and "happy" in the same sentence - didn't you know that? LaurieA
  Using Poser since 2002. Currently at Version 11.1 - Win 10.