Reminders stopped working on iPhone 4S?

I updated my iPhone 4S to iOS 7.1.2 and ever since my reminders haven't been working. When I click the little plus sign to add a reminder, nothing happens and it's a grey-ish colour. Does anyone know how to resolve this?

Had this before. Try the first link and I think it will do the trick. Flip switch off, restart the phone, then flip it on. Best luck.
http://sallyu.com/2014/06/23/reminders-not-working-on-your-iphone-this-easy-fix-just-might-do-the-trick/

https://discussions.apple.com/...ad/5438350

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