I just received an email from Apple stating that my latest build was rejected. When I checked the resolution centre, it stated that the app crashed on start.
As this was a very minor update, I decided to experiment with simple script minify, whereas before I had left it unchecked.
I'll upload a version today with script minify off, but as it takes at least 24 hours for a review to go through, I thought I would post this here in case I'm missing something else, or, if it is the script minify, maybe start a discussion on what's causing the crash.
Might be worth pointing out that I exported through Xcode.