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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?
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!