I remember strange things like these happend to me, too. Some years ago (with Poser 5) I had a character with dynamic hair. Sometimes, when I just loaded her, the hair went away - but only in the preview. The render was ok. I asked the CL tech support but couldn't get much help (or no help at all with this special case). Then, just recently with Poser 6, I used the DAZ Tawhak dinosaur with its saddle. To match another figure I scaled it a little. Then, when I twisted the stirrup it moved up and down wildly, but returned to its position after a short time. So, oddities like these keep happening ...