I have solidworks 2010 and solid cam2010.
All was ok when I was doing little single parts but I got a job to do a load of dogtags
and with the size of my machine being x160 y100 I wanted to put one sheet of material in and cut them out from that. Thats when the problem starts I define all the parts then try to define the stack and I get a program crash and have to restart if I do not restart the computer the solidworks will not run right at all.

Have I missed anything or am I doing it wrong?

I bought a business that was going under and these were on the camputers that cam from the business so I have no contracts for support.