I had the exact same issue, even down to the TV. One not on my Samsung TV, since they upgraded the TV firmware about 10 month ago, Smartthing and the TV no longer worked. After this account login update, now it works? Lastly, the TV would turn off but not on.
I have only 1 location but it looks like it added a new location. I had to re-enter the Welcome code in order to see the hub. The home screen always says, “connecting”. It appears everything is lost and I have to start from scratch.