All embedded videos in articles of the internet and YouTube play sound but no picture

My problem started about 2 weeks ago. Before that, I could directly play any video on Youtube or any video embedded in a Web download.
Now video games, in the sense that I have sound and the time elapsed bar moves along the bottom of the screen, but there is no video, just a complete green screen. This applies to any video on Youtube or incorporated into an internet download.
I can still play any video I already downloaded on my PC, that this Flash Video or MP4 file.
The latest versions of Windows Media Player, VLC Media Player, Media Player Classic and Adobe Flash Player players installed on my PC.
The problem started at the same time there was a major update to my program free antivirus Avast (to the 8.0.1482 version), but it is probably a red herring, as I struggle to believe this might have something to do with the problem.
I also tried on Internet Explorer and the problem is all the same, it is not specific to Firefox.
Can anyone offer a solution?
Kind regards
Barry

Thanks cor - el,.
I have disabled protected mode in Flash, in accordance with the instructions in the link you provided, but it made no apparent difference.
I can't find how to disable hardware acceleration in the flash plugin. Can you help me here?
I disable the Shockwave Flash plugin as a trial and immediately videos appararurent again in videos in the downloads on the internet. Why disable Shockwave Flash authorized these photos seem to I don't know.
It is not practical, however, leave Shockwave Flash off, because many of the embedded videos using Flash so I can't view.
Kind regards
Barry

Tags: Firefox

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