I updated my iphone 4s to 5.1.1 this morning, and throughout the day, fewer and fewer of my purchased apps will open. Now none of them will. I am on the road for a few days so I'll be unable to plug in and troubleshoot on iTunes. I've tried restarting the phone but that only seems to make it worse. Apps that came on the phone (music, YouTube, etc. ) all still work. Any ideas?