Themify ultra

Hello, I’m trying to add modules to my theme (ULTRA), by themify with the themify builder plugin. I’m having problems with it loading. I’ve worked on a few sites with this theme and have had no trouble at all until i recently added their extra add-ons. Even their regular modules aren’t working for me now, as once i place one and set its style to my liking, once i go out of it, the screen turns a darker colour as if its in the middle of loading. Theres no loading symbol and it doesn’t work over time, it seems as if it just freezes. Also, I got a friend of mine to try it out on his cpu and he’s not having any trouble adding modules through themify builder like i am.

any suggestions would be greatly appreciated.