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I've successfully deployed an app to my own iPhone with an ipa file & itunes, but when I sent the ipa to a beta tester he did not succeed to install it. The last step "installing" fails, and the only thing that appears on the phone screen is a dark icon (not the icon I made for the app) + the app name. Since it comes this far I don't think its a problem with the uuid? Also the tester tried on two phones, iPhone 3s and iPhone 4s (I added both uuids). Same issue. Is this a known issue? Can I find hints in some installer log?
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