I’m having the same problem now.
On friday afternoon, I tried to load app onto new iphone 5c.  It built fine, but wouldn’t install on the iphone…the icon tried to install but would quit before it finished (leading me to believe there was a provisioning problem with the new phone UDID number.  I tried the app on a phone that has always loaded apps fine, but it didn’t work there either.
I verified UDID number, then noticed my apple developer subscription expires in a few days.  I had already paid my fee for the new year, but hadn’t created a new provision profile for the next year, so I went ahead and created a new license, private key, and ad hoc provision profile, and loaded them all into a file to replace the old ones.
After all that, I couldn’t get it to load onto any phones.
I opened mobione up this morning to try it again, and a software update popped up, so I downloaded it.  Thinking that may help my problem.  Now the app will not finish building.  It is just looping forever, and it does it with different apps, large and small.  Build number: 121452003
Help!  This is urgent because I took down an employee’s cell phone so I could load our company apps on his new phone before I sent (next day air) to him.  Now he has no phone.  Thanks!