Current setup:
When I conne
Had the same problem with connecting iOS8.3 devices to Xcode 6.2 on Mavericks. Ok on a machine at work running Xcode 6.4 on Yosemite. Software update on the Mavericks machine doesn't offer any higher version. Looking at the specs of Xcode 6.4 (and presumably 6.3 of the original question) says it requires OS X 10.10 (i.e. Yosemite). So, whether or not you can hack around it, the behaviour you/we are seeing on Mavericks is what Apple intends.