Many thanks Joe and AS! I had the same problem with the stack. Just a thought, it may be worth trying one untextured. I had a problem with 5.5, when I tried to save a textured obp...It kept crashing. I then took an untextured one into Bryce 5 and textured it there with the exact same texture and it worked fine.In 5.5 it wouldn't save as an object or as a Bryce scene file!