title: .ipa file install grayed out on an ipad
body: <p>One of my tester is having an issue with installing an ad-hoc distribution build of an ipa file on an ipad.  He said that icon stays gray and also his iTune freezes.  When clicked, it just sits there as waiting.  </p>
  
  <p>The UDID he gave me was the one that he got from iTunes (not the app that gives invalid ffff udid), and I double checked it through checkipa (<a href="https://github.com/apperian/iOS-checkIPA" rel="nofollow">https://github.com/apperian/iOS-checkIPA</a>) and indeed his UDID is included.  Just to make sure I even built him a new build but with no luck.  Does anyone know what's going on?</p>
  
  <p>Thanks in advance!</p>