Update: A fix is now available for VyprVPN for iOS 8. Please read Golden Frog’s blog post for instructions.
For now, the VyprVPN for iOS app will not work with iOS 8 and can result in your Internet connectivity being temporarily broken. However, even though the app is not working, manual setup still works. If you have a VyprVPN profile installed on your iOS 8 device, first delete your VPN profile and then follow these iOS manual setup instructions for Giganews members.
Golden Frog has a full explanation of the problem and fix on their blog here: http://www.goldenfrog.com/blog/vyprvpn-not-working-with-ios-8