It may be a stupid question, but have you tried restarting Poser (and possibly the computer)?

Sometimes Poser throws a random hissy fit and is then very consistent in keeping it that way :)

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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.