I have a 3D model of a piping system I created in ACAD 2009. In paper space, I have 4 viewports, TOP, FRONT, RIGHT, and an ISO.


 
In the ISO viewport, the "lighting" looks great and objects are in good contrast to each other. However, in the other 3 viewports, the lighting is totally different and some objects appear totally washed out to the point were you can't see them.
 
I'm new to 3D in AutoCAD so I'm thinking I must have some setting wrong.
 
Any help would be appreciated.
 
Thanks