@kent I left you an answer below.
This seems to be affecting people using Chrome browser. We're trying to figure out where some users are experiencing this to see if it's in the same place for other Chrome browser users or whether it is at random. So had you just efiled and transmitted the returns? Did you get a message that the return had been successfully transmitted? Then what screen did you go to, or did you click on MY ACCOUNT at that point to try to sign out?
