Are you using an approved graphics card & driver? Run the SOLIDWORKS Rx > Diagnostics to check.
If you are using the nView Desktop Manager, disable it.
Thanks all , had to disable nView Desktop Manager, all good now.
Hi Steve ,
Run with OpenGl Option on to check whether this issue is reproducible. If it works Fine in that mode then sure your graphic card might be causing the issue .To run in OpenGl mode :
1. Open SolidWorks alone.
2. Close all Documents , Then go to Tools> Option > System Options > Performance > OpenGL Mode. Activate this Icon. Try this if it works.