I had a problem with 4.7 not loading maps. I created a copy of mt project from 4.5 I can start the project it loads up, when I click on a map to load. It will start to load it stops at 62%, then I have to force quit everything. This happen a number of times. This problem does not happen in version 4.5. I am behind on using the version, that one was the one I was currently using before 4.7. I have theory on why it happens it maybe a memory issue. I am using a Mac book pro laptop.
Ahh been there myself, it takes a loooooong time the first time because it needs to rebuild shaders, collision data and probably some other stuff I dont even know about.
one of my meshes alone (complex-ish one) took 5 minutes, and the whole level took about 45 min.
Give it some time.
After that it loads like regular.
