Really? I'm using the beta of LI which was based directly off of 254 and I got no crashes at all using that editor. Ebola Zaire PH4ILS!
That wasn't very nice. I think that it may be only certain elements of the editor... I can't remember which ones specifically, but a general rule of thumb is to not even click the unfinished ones. God, I'm not even sure why they put it in if it's not ready to use... anyway, just get a feel for what to do and what not to do. You'll be fine.