I just got word back from JB, this is what he said: "made with patched B4. The last one before 5. I'll check to see if they load into unpatched 4, there was nothing in World cubic or any new mode etc as far as I can recall. best, Jonathan" I tested these files when they were in the store and they worked fine in Bryce 5. Im not sure what is causing the problem you guys are experiencing. I can ask Jonathan to reexport these and send them back in and you can try again to see if they work, or possibly put in for a refund if youd rather have that. Let me know what you want and we'll do our best to get you all taken care of. Ken