App store not working on iPhone 4S after iOS 6 update?

I'm using an iPhone 4S currently runing iOS 6.1.1
Yesterday, updated to iOS 6 using iTunes. The update was successful, but when I opened the App Store, it loaded for ages then just showed a blank white screen with the title at the top and the tabs at the bottom. This has been going on for two days. I've tried countless solutions but with no success.

Try Restoring

This happened to me but Restore fixed it.

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