I have seen this occur recently for some users using Chrome browser.
I don't know what setting in Chrome causes it, but I have mentioned to
TurboTax that some users with Chrome browsers have been reporting that.
TurboTax Online saves
your return after each screen in case one were to get disconnected
accidentally. So you can go a neutral screen where you are not
inputting any data, and then close the browser.
If the problem
continues with your Chrome browser, try clearing the browser cache to
see if that makes any difference. If necessary, you can try another
browser such as IE or Firefox.
We're trying to figure out what screen this is occurring on, or whether it is at random. What screen had you just viewed and were trying to sign out from?