My top Solidworks document constantly freezes after the screen saver activates.  Neither the mouse nor the space ball will move it.  I have to close the document and reopen it for the document to work properly again. I am constantly in and out of my office helping out in the shop so my company requires me to have a password protected screen saver active to avoid others in the shop from accessing the internet. This phenomenon only happens with Solidworks.  Has anyone else encountered this?

I'm using Solidworks 2010 SP 4.0 on a Dell precision T3500 2.93 ghz 64 bit  Xeon processor with Windows 7.  My video card is a Quadro FX580 and my driver is up to date (8.15.11.9038).  

Dave