Just updated iPhone 5 to iOS 7.1.2, now it won't sync with iphoto 9.4.3

Just updated iPhone 5 to iOS 7.1.2 (from some version of iOS 6), now it won't sync with iPhoto 9.4.3 on my MacBook pro (running OS 10.8.5). I plug it in and iPhoto recognizes the iPhone but only displays a 'Loading..." message next to the 'New Photos' page.

Tried it also on my older Mac Pro running Snow Leopard 10.6.8 and iPhoto 9.2.3 and same problem.

Any ideas? Already tried rebooting both devices.