A lot of the time a reboot helps solve the problem. As Ockham said it's a known bug. I usually call it "Poser Fatigue" as it's prone to happen if you've let Poser stay open for too long :)

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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.