Project Won't Load

So yesterday my project was working fine. Everything loaded, played, etc... (Do note this is on Windows.)

Then today I'm on my mac and I use Github, pull down my latest commit (which as I said was working). It opens in Mac just fine. However, once I closed Unity, the project will no longer reopen. I'm generally confused and scared.

The only way to get it to work again seems to be deleting the Library folder, isn't that weird? Then once it recompiles Library and I restart, right back to "Not Responding" whenever I open the project.

 

I tested deleting every thing that can be deleted (so everything but Assets and Project Settings), and only deleting and rebuilding the Library allows the project to be opened ONCE. Quit and Restart and Unity will go into "Not Responding" once it tries to load the project.

 

Bump in hopes someone who had the same problem and fixed it sees this...