@burnout426
Don't worry, everything is fine. You warned me. I knew what I was doing.

@burnout426
Don't worry, everything is fine. You warned me. I knew what I was doing.

Hello, everybody!
Some times later in another topic I was wrote about analogical problem (my post here https://forums.opera.com/post/143714).
In begin april we have some updates, opera, flash and windows. After installation of all updates, I was got that problem with flash videos - black screen and sound.
@burnout426, @Ceedee, @nvmjustagirl helps me and was recommend me to update video drivers.
In those time I was think then driver update is helps me to solve that. It's not helps. Drivers in beta version and works not proper. I was got black screen after sleep mode, flash video freezes. It's not good for me and I was roll back my system state. I was restore it from image (from february 2017). In that image I have opera 43.0.2442.849. Only after some failure attemps to localize a problem, I was understand:

• windows updates not broke flash video
• flash updates not lead to this problem
• only after opera update to latest version I was got this trouble.
  I was disable autoupdates by rename opera_autoupdate.exe

Now I have latest version of Chome(66.0.3359.117): trouble is here - video is black screen, sound - ok;
latest version of Firefox (59.0.2) - video is fine.
Opera 43.0.2442.849 - video is fine. I think if I enable autoupdates I was got black screen again.

@burnout426
You help me! Thank you. After drivers installation videos with video again

@Ceedee
Thank you too!

Trouble:
When I click play on video player I hear sound and don't see video, only black screen.

Reciept:
Update your video drivers.

@ceedee
Thanks for help. Ok. I have:

Hardware:
Notebook HP PAVILION dv6-6b57er
CPU Core i7 2670QM 2200 Mhz
GPU Intel HD Graphics 3000 + ATI Radeon HD 6770М

OS: Windows 7 (64bit)

Opera: 52.0.2871.40

I have problems with flash videos after last update of opera. When I click play on video player I hear sound and don't see video, only black screen.

I was try fully uninstallation of flash player following that instructions:
https://helpx.adobe.com/flash-player/kb/uninstall-flash-player-windows.html

Next I was install flash player 29 again. Problem wasn't solved.
Next I was full uninstall flash player 29 and try version 28 from archives. No effect.
I was rollback to flash 29.
I was disable everything installed extentions. It wasn't helps me.
I was try to enable flash in settings and add sites, where I watching video, in exceptions with Allow param. That wasn't solve my problem.
I was check driver updates for my video cards by windows control panel (drivers are actual) and was looking for driver updates on hp.com - nothing new.

In other browsers:
Google Chrome 65.0.3325.181 - Sound: OK, Video: black screen.
I was trying fresh version of Yandex Browser 18.3.1.1124 - Sound: OK, Video: OK.

UPD:
On some pages I see message about plugin blocking:

What I want do next? I want to create backup of opera, then uninstall she and install it again.

@vincej1657
Confirm. I have this problem too. It's happens after last opera update.
I was fix it by disable hardware acceleration in settings.
But i think it's not right, because now I have freezes in flash videos.
If hardware acceleration is enabled - i hear sound, but I see black screen instead of video.
I'm was try to update and reinstall flash player, but it don't help me.