Strange Drawing Behavior

I have what appears to be a civil3D drawing.

I am using Carlson Survey 2008with embedded AutoCAD. I use TruView to convert the drawing so I can open it.

I am looking at the drawing in paper space, and I see all of the curb lines, drainage structures, light poles, etc. When I look at the drawing in model space, I cannot see all of the improvements.

I have looked at the layers, and I believe all of the layers are turned on and visible but obviously I am overlooking something.

Any advice is greatly appreciated.

Thanks

EDIT: I think I figured it out. It was a layer filter state issue I think.