I'm also getting stuck on the loading screen, even with no mods installed. And yes, I've followed the instructions correctly as far as I can tell. Just replaced KSP.exe and mono.dll. http://i.imgur.com/o3Zhqh4.png I downloaded and installed the Unity Editor from this link: http://download.unity3d.com/download_unity/UnitySetup-4.6.4.exe Any thoughts? Thanks! EDIT: Reinstalled the game (by deleting the entire KSP folder manually) and now this works. Putting back mods now. I'm thinking that something might have went wrong when I was using Procedural Parts on 32-bit and restoring original parts with un-pruning. EDIT2: Put the mods back in, same problem -- get stuck again. Then removed the mods and still stuck. SOLUTION: I figured if I launch the game with Launcher.exe instead of KSP.exe (aka player_win.exe from Unity folder) I get pass the loading screen fine. If I launch with KSP.exe then it gets stuck at the end. Looks like all the mods work (namely Outer Planets Modded Mod, AVP, and all that shiny stuff). Yay!