The problem seems to have returned now even with saved drawings on his computer.

He is also having some other issues with closing drawings and shutting down autocad. 

When he wants to close a drawing he has to minimize the drawing, then maximize it again before it will allow him to close it.

Also, when he quits autocad it takes up to 5 minutes for it to close and often has to be force quit to shut down.

Is this an issue with the current OS he has on his Mac or a service pack he needs to install??