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@relaxator Ну это, как мне кажется, не ошибка. У вас в настройках youtube выбрано, скорее всего, тема - как на устройстве. А у Оперы GX тема, по умолчанию, черная, потому и ютюб черный. Уж не знаю баг это или фича. В общем зашел в настройки в опере и сменил тему на светлую. Теперь всё в огнях.
@naheed Why suggest a method that doesn't work? In addition, a fix has already been released from the developers that fixes the problem.
@sldoom Вчера на забугорном форуме отписался разработчик, что обновление будет сегодня.
Сегодня вышло обновление LVL 2 (core: 71.0.3770.234)
Проблема устранена.
@operawm
Updated to LVL 2 (core: 71.0.3770.234)
The problem is resolved. Thank you so much!
@denislavd said in Dark theme in pages is forced even when not selected.:
I randomly found out that if you open Inspect Element (Ctrl+Shift+C or Right Click -> Inspect Element) and close it right after it will fix the issue for quite some time.Works 100% of the time for me.Hope i helped
In this thread, we wrote about this "solution" a week ago. Only this is not a solution. It's a crutch.
We are still waiting for a patch from the developers.
@operawm Disabling hardware acceleration did not solve the problem
https://youtu.be/G7cyv-dutDY
@remfoxx This is not a solution. The problem is not solved.
Opera support told me on FB that they are already working on a solution to the problem.
Translation: "Good afternoon, we are already dealing with this problem!"
Служба поддержки Opera ответили мне на FB, что они уже работают над решением проблемы.
@andrepsicologo Windows update didn't help.
But opening and closing the inspector still temporarily solves the problem.
@leocg said in Dark theme in pages is forced even when not selected.:
Try resetting settings and flags to see if anything changes.
Resetting to default doesn't help 
@JFrigo https://youtu.be/FI-z3yfeWPU
Everything works fine in private mode. The background is white.
It's strange that in normal mode, after opening and closing the console, everything also works and the background turns white.
@leocg Windows 10 19041.510
There are no extensions installed on the GX either.
@leocg said in Dark theme in pages is forced even when not selected.:
Still getting white backgrounds here.
@leocg I can give another dozen (hundred) examples, if needed.
https://www.webnode.com.ua
https://tilda.cc
https://novaposhta.ua
https://pixabay.com - bottom
https://polygons.pro/portfolio/design/zatyshnyy-dim-ta-idealna-kartynka-sobi-flat
...
@leocg Any site that does not explicitly specify background ( background-color) is displayed with a black background.
https://rozetka.com.ua
https://urp.ssu.gov.ua
https://texterra.ru
etc
Абсолютно аналогичная проблема после обновления пару дней назад.
www.youtube.com/watch?v=qXC8QQHmj8U