Thank you bhoins. Please explain. I've been using Bryce 7.1 Pro exclusively with the LAA flag set for 3+ years, the earlier versions down to 4 at rare times but also set to LAA. The only parts I can imagine crashing with the LAA set is the IL which I haven't used a lot and Displacement in the Mat Lab only works if Priority is set to low, otherwise Bryce crashes LA aware or not. If there are some catches in the code, I would very much like to know where.