Another glitch was discovered (recently?) in Poser. If one adds a poser prop (or maybe even an imported prop) to a scene, then increases a dimension (or maybe all dimensions) of the prop drastically (perhaps 500% or more), the shadow-map calculations are screwed up. The end result is that props, perhaps even those that were not resized in any way, will either cast no shadows, or they will do so in an unpredictable or unsatisfactory manner.