Well, I’m using Unity 5.3.2f1 and the Editor won’t work. The Editor crashed, so, naturally, I relaunched it. It said ‘Hold on - Compiling Scripts’ or whatever that message is. Then, the screen went away and… Nothing happened. The Editor just won’t launch. I can open and use all my others projects fine, just not the one specific project. I did some Googling, and found fixes for Unity 4, but I don’t know if those will work. I’m running Windows 8.1. Any help would be greatly appreciated. Thanks in advance.
Try deleting your library folder for your game.
It’s completely safe but will take possibly a couple hours depending on your project size, it’s just sort of the “references” of everything.
But do not do it while Unity is open. Always close it before deleting it.
Snippet from this docs page.
it is always safe to delete the Library folder (while the project is not open in Unity) as all its data is generated from what is stored in the Assets and ProjectSettings folders.