@playwolf Bit belated but it's of Microsoft/Windows doing,
After a update your firewall blocks opera which it notifies you.
However it causes your sound to be disabled
Fix is to go to
sound mixer options (In WIN10 search box) and click reset
you may have to then renamable your preferred sound settings for better quality
@lio00 I don't know but I found this by trying disabling filters one by one, you can try with other filters. Also if you're using another adblocker you can also try that with it.