Screen anomaly

I ran Cosmos express on this part then rebuilt and switchedviews in the model and this appeared on the screen. Does anyonehave an idea of what it is and why it may have happened? As soon asI rebuilt, it went away. I am assuming it is some sort of graphicsissue.

I am using the current SW approved driver for my card but haveseen other odd screen anomalies (graphics window not repainting,feature tree background going blank, screen saver image in graphicswindow...).SolidworksGeneral