Hrm, ... i don't know what to say on that.. sounds like a glitch. Have you tried to install that Bryce on a second machine?

My Bryce 5 likes to crash randomly whenever I'm importing a .DXF file.. even if it's a font object from elefont. But not all my machines are configured the same, and on some there's no crashing.

I just tested with B6.1 and I'm getting a "invalid format".....  tested with another car model and it came in fine. Maybe some of the models are glitched.