I've had simular problems with some props not exporting very well as an OBJ, usually the one's that were origionally in another format (3ds, dxf, etc...) My suggestion is to export the figure without the prop as an obj, then just the prop as a 3ds, then import both to bryce...saves alot of trouble if you put the entire figure in a big box that completly covers the figure, and export it in both exports....this allows you to line the two imports up in bryce, and keeps the size consistant. 3ds exports from poser to bryce require quite a bit of smoothing.