Also did you try changing the password and using the enter key?
If you are using the new email login, you can't use a blank password.
In parting, ALWAYS create a spare admin account so if you ever get locked out you can fix this without having to reload the OS and wipe out your files.
Been running win 10 for quite a while now with few problems. I don't use a password on startup and don't want too. Recently if I leave my computer running and go of for lunch or something when I come back it is asking me for a password to get in. I switch off the computer leave it for a little time, start it up and it works fine without asking for a password. How can I get rid of this irritating problem?