Sorry gang, we’ve been hacking you this entire time and last night was the culmination of… oh wait, that’s next week? OK… ignore that.
Google went wonky last night and forced a lot of people to log into their accounts again. You’ll see a triangle with an exclamation point and notice that none of your Google services are working properly.
It’s a Google thing, you probably weren’t hacked.
Should you be worried, you can check everything that’s happened, logged into your account, or otherwise been noticed in Google Security.
No word on cause yet, or maybe there is but all I’m seeing right now is antihistamines.
You will need to log into your account in several places if you use Google Drive, Gmail for business, photo sync, etc. Logging in to one thing will not work across all things.[Android Central]