I had this happen on a few occasions in the first release of Poser 8. Since I don't have PP2010 yet I can't say if it's the same thing, but it sounds similar. As I recall it, the problem was eradicated with SR1, but that may have been a coincidence :)

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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.