Could be possible next update, the Ensable/Disable effect on the side panel could be more visible (maybe it's me, can't make out gray properly). I mean, you know "by ear", but I'd prefer a different colour, like the REC button.
Just a humble opinion.
Have uninstalled, rebooted. Still getting crashes....damn.
(IOS 7.0.4, ipad air)
Update: have since updated IOS to 7.1 (not requirement for AB2, but tried anyway), reinstalled and rebooted. Am now happily making music again with AB2 working fine. Brilliant app.