I have following problems:
1.
Colors are floding outside the part, and into another.
 
2.
I have changed the color to a Ral color in the part, but it does not show in the idw file.
 
3.
Some times a "shadow" is covering a view
 
Heeeeelp....
 
 

Any "graphical" problems are usually related to using a not certified graphics card and/or driver. Make sure you are using an Inventor-compatible graphics. See www.inventor-certified.com/graphics