Significant changes to your operating system and/or browser can mean you need to delete & re-register the device as the TV Anywhere server no longer recognises it. This could also occur if you use more than one browser & are trying to use a different browser to the one you registered with.
Welcome into the Community, it's good to meet you, I hope you've had a good look around.
Looks like Crocket has been in and given you some sound advice on the registration post OS update. I would like to add that if you would like to check your allocations, they should be updated to accommodate the changes.