@amersy Type in your search bar "opera:flags" and click the button on the top right to "Reset all to default" . Otherwise if that still doesn't work, a last option resort would be to go to the very bottom of your Settings page in "Advanced settings" and click "Reset settings" . I know that might be an inconvenience but if the other options don't work you can always rely on that. Have a good day!

@palmo123 Make sure in your (Settings > Advanced > Privacy and security > Cookies and other site data) and turn off “Clear cookies and site data when you quit Opera”. Also don't erase the Cookies and other site data and Passwords and other sign-in data before closing the browser. That should fix it.