We are using DayPilotPro-7.1.2730 and have found that if we have crosshairs enabled (full or header) that it prevents EventSelectJavaScript and TimeRangeSelectedJavaScript from firing in devices running IOS 6 (tested with 6.0.1). This behaviour can also be replicated in your Sandbox version. Strangely though, it works ok with a device that runs IOS 5.1.1.
Is this something that can be looked at in a future release?