Hi - I'm not too sure how useful my thoughts will be on this but I definitely remember having a problem like this when I first fired up my Digi001. (Incidentally, if you haven't watched the hour long promo video on Youtube, it is good for a few laughs).
I just fired up my machine and it looks as though I'm running 5.1.1 with my digi001 so it's probably worth heading to the dl boards and seeing if you can get that running. If I remember correctly, though, my crashing had to do with OMS in some way. I think that I trashed the pref files and then re-built my system setup.
I know that I had the same issue at one time - unfortunately, I can't remember the exact solution. Give the 5.1.1 version a try, though.
D.