Scroll all the way to the bottom.
Click the menu ( : ) then settings. Make sure Google Now is "On"
Click Accounts and privacy.
Make sure "Google Account" is set to the right one.
Something to keep in mind after any major update, Google apps that dont maintain personal data like pictures, docs, and what not may have had their data cleared during the update and need a day or so to sync with google's servers to function again as you expect.