Part Display Problems

Is anyone else having issues with part seemingly disappearingwhile working on them in SW 2008 sp 3.1? The part is still there,but it isn't being displayed. You can roll over the features in thetree and each will highlight on the screen, but still no geometry.I can force a rebuild, change display types, etc. Nothing helpsexcept restart SW.

My display card is a certified card (nvidia 350M in a dell M60laptop).SolidworksParts And Features