Hi, Franco
If that's the Msg. your getting, Check your Windows Task Manager, You'll see even though it say's Not Responding LazyCam is still crunching your file.
Look under Performance Tab, CPU Usage willl be at 100 % These files are usually pretty big and take a some time to sort out.
One other thing to check, Make sure that Mach is Stopped and Reff. to Home, It uses allot of CPU Time when it's Running.( Hear Anyway for me).
Hope this Helps, Chip