Incidentally, in case someone else happens along this thread looking for some help...
This got me thinking so I went back and tested an old rig with a nVidia GeForce 8500 GT. I downloaded an older version of nHancer (2.4.5) and was finally able to get it to work with the following settings:
1. In-game enhanced off (This returns sun halo/glare).
2. Multi-sampling gamma correction on.
3. Multi-sampling AA on and set as high as your system can handle. (Use Ctrl-F8 to check FPS).
4. Pre-render limit 2. (Anti lag).
5. And then perhaps most importantly, AA compatibility set to: '20000000: EA Strategy Games.'
Never thought it would happen, but it worked like a charm!