I too have been having unexpected crashes and I am also using Beta-SP source material in component, in Media100i mode. One of the most common crashes is after re-acquiring footage. If there is any problem, and the line item turns red (which it seems to like doing for no obvious reason), the whole system crashes.
I’m just assuming that this problem is not isolated to my system. I’m using Media100HD 10.1 on a 2-gig G5, OSX 10.3.7 with 2.5 Gig ram.