I've had a few crashes in Beta while editing audio. It was after opening an wav file in the preview window. It will be a soft crash at first, with the menus all being blank when trying to open them. The play head will no longer scrub, but you can move it and play, but everything is frozen on the screen exactly when the soft crash happened. Sometimes Alt+s worked to save work and another time it didn't. It seemed to only happen when editing a separate audio file. It would happen after 1/2 hour or so. It wasn't something that could be recreated on demand, it would just happen randomly.