How did you find out about the problem? If someone with a mac is telling you there is a problem ask them if the centerpoints for the clothing bodyparts are still the same in Poser as the for the figures body parts. This is easy to check in the joint editor window. They should be the same numbers and the crosshairs should line up the same. I'm no expert but in some modeling packages the numbers will be the same but the actual points do not line up because the coordinate systems are local and they are offset or scaled differently.