Attention iOS 7 users: If you are unable to access a password protected folder, please update Private Photo Vault from the App Store.
The latest update should be available today: September 17, 2013. It has support for iOS 7 and is better than ever.
Private Photo Vault v6.0
+ Bugfixes for latest iOS
+ Built-in Photo Editor is Even Better!
+ Performance Enhancements
+ Added support for new languages