Ok, is it failing to build, or is it packaging and then crashing on the device? Can you link to this thread build fail output logs if it is the former, and logcat logs if it is the latter?
Just guessing, but when you moved from 4.6 to 4.7, did you make a copy of your project or did you choose the convert in place option? Sometimes it does strange things to blueprints, among other things. Nothing for it now, but when you update (which is coming, 4.8 is on its way), always just make a copy.