1.28E has not been released. One of the key features is the end of those 30 plane files like "planes.dat", but that means a lot of work for us in splitting them to have individual skin and FM folders. My report re SPAW was just to indicate that I had done that successfully, and was able to use SPAW with 1.28E.
Anyhow, back to solutions.
Have you tried the d3d windower? It usually fixes the map problems, and if it works for you it will be the easiest solution. It works fine with my ATI HD4670, and the driver that Vista installed.
If not we will take the 1.28D path, with a workaround that uses the 1024x768 1.28D screens and menu files in place of the 640x480 SPAW ones.

Jel