If you change the appearance of an object to any type of white it shows up as grey in both rendering and IDWs which is incredibly annoying.
People ask why it's grey ont eh drawing and the note says paint white.
Selecting self illumination is really not the answer, I just white to be white.
Other people are having this same problem.
http://forums.autodesk.com/t5/Inventor-General/White-s-Aren-t-Appearing-White/m-p/4590015/highlight/...
http://forums.autodesk.com/t5/Inventor-General/2013-where-is-flat-white/m-p/3688078/highlight/true#M...
http://forums.autodesk.com/t5/Inventor-General/Product-Imagery-The-White-Effect/m-p/3378891/highligh...