Great but crashes on startup – Sums gesture controlled calculator Review

Love the app for casual computations, interface is slick and once you learn the gestures calculations are faster than with standard calculator app. App frequently crashes on startup when launching for the first time and I have to launch it two or three times to get it running. Once in though, have had no problems at all. iPhone 5 on iOS 6.1
Review by I ride Trek on Sums gesture controlled calculator.