When making Dev builds for testing locally on a device, my process has been to build the app – which places my IPA in /Users/stevelombardi/Music/iTunes/iTunes Media/Mobile Applications.
Since I need to get this onto iPads and/or iPhones which are paired with other iTunes libraries, I have been installing the apps by dragging them from the Finder to the device's icon in the Xcode Organizer window. As I said, I have been doing this ever since the release of Xcode 4, up through 4.2 and it's worked great.
However, now with 4.3.1, this process fails with the message
No application exists in /Users/stevelombardi/Music/iTunes/iTunes Media/Mobile Applications/Tomato Match.ipa
I know the IPA is fine, because if I submit it to my TextFlight account, and install it on the iPad that way, it runs without incident.
So why can I no longer copy IPAs with the Organizer?