I don't have crystal but I've just created 2 aux busses and thrown several virtual instruments and 3 DLS's on each and it hasn't crashed.
My setup is very similar - 450 (gutless sawtooth?), 768mb, 10.2.6, 6.0.8 full.
No midi devices currently plugged in, but AMSetup aware of a midisport.
Time to trash your preferences? Unless someone else has the same trouble. Have found some of the AU's are not 100% compatible yet with every app. It could be crystal doesn't like Metro or somethng like that.
Do you have the problem with DLS to or just assuming?
Welcome back to Metro.
scoot.