I always stay logged in on Ebay and have Opera set up to keep local data set as I always have but since the last update I get logged out of everything when I close my browser almost like when I clear history but all my history is still there. What changed on the update?

My Windows recently updated and now I cannot use Opera as my default browser. It does not show up in the list of default options and it will not allow me to choose the default by app. When I try to give Opera all it's defaults it does nothing. Won't even allow the option.