I can't log in to my instagram account?

I've had the iPhone 5s for quite a while now, really like it. I got the recent Instagram update which was fine. On Monday I logged out of my personal Instagram account to log in to another. Now I can't log into any account! I can log into account from instagram.com website, which is useless as you can't do anything from their website, I can set up a new instagram account from the app & log in but for some unknown reason I can't log into my already established accounts. It's driving me crazy! It appears a window completely blank as if i was blocked out of my account.

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