I have the latest version of Vivaldi: 3.5.2115.87 (Stable channel) (64-bit) The problem was I had unchecked the Crypto button under Google. After re-checking that setting, it is now working again. Thank you all.

You are right ! it was not the good format file, I've just downloaded the good one and everythin is okay ! Thank you much !

@mib2berlin I figured it out. Using your suggestion to load it in guest view without any extensions running, I was able to determine that it was an extension called Iobit Safe Surfing Protection that was causing the problem. There must be some sort of incompatibility with that extension on the latest updates to Vivaldi as I have it installed and running on the other browsers I mentioned and it doesn't happen with those. Anyway, it's working fine now. Thanks for the quick and helpful response.

@balachandarsmr Thx, seams to work well.

I solved my problem. Noticed that the GoodTwitter extension was still active. My bad.

What version of macOS are you on?

@radi8 It was an extension Might help others if you say which extension.

Yep was an instagram extension. Thanks

@audunsvante I'm glad to hear that 1Password is working for you now. Thanks for the update! Wishing you a very Merry Christmas as well!

"Enjoy Movies Your Way" is the name of the extension.

Thanks for the hints and tips. As soon as i have a bit more time, i will working on it. Stay tuned.

Well, another of life's mysteries! Last night before going to bed I checked again and Whatsapp would not start with UAS disabled but then worked again when enabled. This morning UAS is not needed. Whatsapp works with or without it. Laptop is always on but no overnight updates and nothing else changed as far as I can see. Go figure!

@Gwen-Dragon Ah, sorry; I should have thought to try a Guest session. There there is no problem, so I guess an extension is interfering. I'll look into it. Thanks much Gwen.

@arafat try turn off your extension one by one at one of last updates i had similar issue with similarweb extension

Ah, solved it - it was the extension 'Empty New Tab Page' that caused the issue

@Leander100 , das freut mich. Generell sollte man vorsichtig mit erweiterungen sein und nicht mehr benutzen als nötig. Viele Erweiterungen sind ausserdem überflüssig weil sie dasselbe machen wie eine in Vivaldi vorhandene Funktion, also redundant sind, oder weil si gegenüber einem Direktlink keinerlei Vorteile bringen, was bei RT Deutsch wohl der Fall ist. Ich benutze eine ganze Menge von Erweiterungen, aber hab nur wenige von ihnen aktiv (uBlock Origin, Trace, I Don´t care about Cookies, IM Translator, Lunapick, Imgur), die meisten von ihnen aktiviere ich nur wenn es nötig ist.

@jtjaynes thank you very much! But just disabling the extension was not enough for me. I had to completely remove it from my browser, sadly

@Priest72 those people have UBO Team as tags next to their usernames so reddit users understand their expertise -- reddit is the official place to get UBO support. If you hang out on the GitHub project you'll quickly recognize gwarser & uBlock-user as contributors there.

Um diese lästigen Cookie-Popups auszublenden, benötigt man übrigens keine Erweiterung. Es reicht wenn man, unter Privatsphäre -> Trackerblocker Quellen, diese Liste hinzufügt: https://www.fanboy.co.nz/fanboy-cookiemonster.txt URL kopieren und hinzufügen. Klappt wunderbar. Und eine eventuelle Störquelle (Erweiterung) weniger.

@Vivaraesso Ja, auf manchen Seiten führt das Blockieren von Cookies zum Nicht-Abspielen. Danke für den Hinweis.