Chances are that your layout is damaged. I'd delete the layout and recreate it from scratch or copy it over from a back up copy that does not show this behavior.
I've had a similar problem with FMP14 Advanced as well. My workaround trick that worked for me was to switch layouts after editing, then go back to browse mode. I avoided the application unexpectedly quitting.
Question: Does it crash even if you don't edit the layout; just simply switching modes? I've found the problem only occurs if there is any editing involved.