No problems installing the GM, and I also have iTunes 11.1b48 on my iMac. But when I try to restore my pre-IOS 7 apps, I get the attached screen shot which tells me to authorize "this computer for items purchased from the iTunes Store, choose Store > Authorize This Computer. But I find nothing in iTunes called Store. And my iPhone is "authorized" under iTunes. Suggestions? Please be specific if you can. Thanks!