So I've seen people having problems with crashes but thankfully I've never crashed what I get instead is when entering the CIT ruins I will either fall through the floor along with all the dead bodies slowly floating in space, watching poor dogmeat try to reach me as I fall into the abyss. I cant fast travel because my character is jumping *SIGH* or I will stay In The room but I can't leave as the door and walls have not loaded in.
So annoying this is the main quest where I have to meet father in the ruins.