It still happens in pp2012. I was told by SM that they think it is caused by having too high of hair density. They didn't have a fix. The only thing I have found to do is delete the group with the problem and try again.

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Available on Amazon for the Kindle E-Reader Monster of the North and The Shimmering Mage

Today I break my own personal record for the number of days for being alive.
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I use Poser 13 and win 10