When I create the hillshade everything looks fine. If I save the mxd file and open it again everything sill looks fine, but as I mentioned above if I remove it from the mxd and bring it back in that is when gets dark. See attached files of the same hillshade. The light one is before I remove and the dark after I bring it back in to my mxd file.
I'm in a geographic coordinate system and I created the hillshade with the correct z factor.
I didn't have this problem in 9.3.