@osh1980 Ok. Okazało się, że to jednak nie Opera winna, tylko Nieaktualne sterowniki do karty. Wątek zostawiam, na wypadek, gdyby ktoś miał ten sam problem.

@osh1980 Macie tu porównanie:
Bez tego cudnego Lucid Mode

I z włączonym:

Czy ktoś mi powie, jak się definitywnie pozyć tej „wspaniałej” funkcji Lucid Mode? Poza oczywiście instalacją starej wersji, która jej nie ma? Bez jej włączenia nie da się praktycznie już niczego obejrzeć na YT, bo wszystkiie filmy sa tak potwiornie ciemne, że nawet rozkręcenie jasności na maksimum niewiele pomaga. Ktoś to w ogóle testował?!

Opera from 66 is totally useless for users, they using bigger fonts! Here is an evidence: upper Opera 65, lower opera 70. Both has the same fonts and page settings! Until you make something to correct this error I won't use any newer version than 65!
https://imgur.com/a/SYQYlba

Sorry. Totally unusable for me. I updated it to 66 and after update, all my pages looks awful. For example: https://imgur.com/lQ7AvoL
But it's something worse. Who the hell deleted option to disable automatical update?! I was forced to restore version 65. After this restoration (and repair) some of the pages won't load (Facebook for example, but also this: https://www.apmmusic.com/albums/BR-0089). Opera loads it endlessly, and the only option is to turn off Opera and then start it again. But this helped only for one time. I had more times to turn off Opera and start it again. Luckily for me, next day was all correct. Magic!
And I thought my problems were over. I prevent Opera to autoupdate by setiing environment variable. But on Saturday's evening, after I started Opera I saw identical page look like after update to 66! After I checked it, I saw, Opera updated to 66!!! And now I have problems with this endlessly load on some pages. Facebook works ok, but APMMUSIC not., I ask you: who the hell is responsible for this <CENS> autoupdate option?! And what I have to do now, to restore correct setting my Opera WITHOUT completely wipe it out from my Computer and reinstall?!