I’ve had several render-time crashes with BCC v6.0, and although I think their plugins are, for the most part, stable, when things such as Bump Maps are used, there seem to be more problems. At this point, I see that anything which relies on OpenGL heavily may be less stable. I have a quad-core Windows 7 machine, however the OpenGL code between Mac and Windows versions may be similar.
No soultion except as the previous poster said, ride them until a solution is found.