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I have the original CD version of the game, and double-jumping does not work when its running in a window. This for both the original installation and the 1.01 patch. Anyone have this problem with the GOG version?
Unfortunatly the GOG version still appears to have this problem.
http://www.gog.com/en/forum/duke_nukem_series/q_manhattan_project_double_jumping
It's because of running in a windowed mode. It's already been covered in this post in this forum:
http://www.gog.com/en/forum/duke_nukem_series/q_manhattan_project_double_jumping
Actually I managed to get double-jumping to work in windowed mode - all you have to do is switch from Direct3D to OpenGL!
Now I'm running in a 1440x1080 Window (my monitor doesn't support this res in full screen for whatever reason) and the game looks great!