no it goes like this,, Google now secretly owns Opera,, so in order to get their Google spyware "Google Updater" on your computer , you are now forced to install google chrome in order to export bookmarks from opera and then into firefox. Its smart business. Google updater is deeply entrenched in your computer once you do it, and Google offers no true uninstaller. You literally have to edit registry keys to turn it off.

I was having this problem as well in Opera 19. The only way i can get Youtube login and google + login to work together so that i could comment was to uncheck "Block all third party cookies" in the settings under browser security