I to have noticed some weird stuff with certain scenes using the network rendering, but as of now I haven't been able to pin it down as to what is doing it. You might try changing just little things in it, like turn of the sky or just pick a diffrent preset and try it again.. I am still working on the whole network issues, like the pause/resume feature, and how Bryce determines how many squares a picture is going to be broke into. Hope that helps you a little.