Every time I run DRC I get stray Traces and hundreds of errors. The ghost traces are on different layers and cause Width, clearance,distance, etc errors. Images of Before and after running DRC shown below. Currently using Eagle 7.1 -- Have had problem in previous versions of 6 but seems to be getting worse. I'm running Win8 Pro. Don't know if it is an OS problem or not. Images persist on reloading but disappear when I delete the '.pro' file. Ghost traces don't appear to get imbedded into Gerber files but do create problems running down trace errors. How to I prevent this behavior.
Before Running DRC
After Running DRC