I've just rebuilt an app and when I try to install it via iTunes on my test device, it looks like it's installed, but when you click on the icon, the name changes to "Installing..." and nothing happens. I've tried an app store build and a debug build and they both do the same. I tried another app, and it's fine. The phone is an iPhone4, running iOS 7.1.2.
What can I do to debug whatever the issue may be ?