I know you're dealing with a lot on your end, but I feel I should put this in here for when the time comes so that you can look into this (and before I forget about it and run into it again... ;-_-): on my machine, the current Nightly build just stops between the start-up screen and the editing window. I click New character, the window changes to the editing window with a dark gray over it, and...nothing. It doesn't budge from there. It stayed like that during a 30-minute wait. I had to force quit it to make it stop.
If you need more info about my machine, let me know.