Has anyone had this oddity happen to him or her?  It has happened quite a few times to me. 

At seemingly random intervals, and while performing seemingly random tasks, Carrara's assembly room window suddenly goes upside down, and the program becomes totally unstable.

The only way to get it right is to exit out and reboot, then go back in and cross your fingers.  Oh yeh.  When you exit the program, Carrara locks up and you have to use task manager to shut it down.

I could write a book about all these weird bugs... LOL