Man that does sound like a bug. I would let SM know about this straight away. Whenever I've had problems with the software I give them a mail and they jump right on it and help me out.

The greatest thing about animating in Poser is that it's cheap and that there is this amazing library of characters to choose from. I've managed to get some great results with the software, it did take time for me to figure out all the trick for using poser correctly in relation to animation. It's all about learning and having fun!

cheers

SKAmotion