Problem 1: Starting a new game takes me back to the main menu.
Solution: You tried to launch the mod through _eduke32.exe rather than DNF.bat, which is the correct file.
Problem 2: Graphics are messed up/I'm getting the "hall of mirrors" or "melted textures" effect.
Solution: Either you're missing DUKE3D.GRP, which must be in the same directory
as the mod, OR you did not install the mod to an empty directory. If you have
Duke3D on Steam, see the readme for the exact location of the GRP file.
Problem 3: When I enter a map, there's a Village People poster on my screen.
Solution: You're trying to run the mod in Polymer, an unsupported render system.
Find your eduke32.cfg file, open it and find the line where it says Polymer = 1.
Replace the 1 with a 0.