Notes client crashes when computer locked

One of my users has a problem: Whenever he locks his computer (by pressing CTL+ALT+DEL) or if the screen saver comes on, his Notes client quits, leaving an NSD.

It happend with a 6.5.2 client. He reinstalled version 6.5.1 and still has the problem. Our server is at 6.0.2 cf1.

Any suggestions would be helpful

Thanks,

Jim