I am getting repeated error messages that are making my Nexus 7 unusable. Every time I use it a "Couldn't sign in" (GMail) message appears. I have changed my password and can sign in on my PC where I have no problems.
I have tried deleting GMail and every other google based app I can find but the error message is repeated ad nausium.
Last night I received an update to 4.4.4 and it is still happening!!
BTW the message pops up in every app its just stopped me using Facebook