Can someone please help me out? I have been working on a few parts, and when I change views I sometimes get these squiggly lines on the parts.  I'm using the setting for Shaded With Edges and it seems the Edges are getting wonky on me.  Is this possibly a graphics card issue?  I have attached a picture that shows the issue I am having.  Im using SolidWorks 2012, with all updates installed.  Thank you!