Hello,

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Thank you!

Here are a couple of pictures of the problem. The first shows the empty space in Youtube where the flash player should have rendered. The second shows the desktop when Firefox is minimized and how the flash player renders to the top left corner of the screen and also how the flash player gets its own task bar icon.

This is not specific to Youtube, it happens with all Flash player content on all websites.

I did also reset all the flash player settings in firefox to their default values.

You can try to disable hardware acceleration in Firefox.

• Tools > Options > Advanced > General > Browsing: "Use hardware acceleration when available"

You need to close and restart Firefox after toggling this setting.

• https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes
• https://support.mozilla.org/kb/upgrade-graphics-drivers-use-hardware-acceleration

You can check for problems with current Shockwave Flash plugin versions and try this:

• check for updates for your graphics drive drivers
  https://support.mozilla.org/kb/upgrade-graphics-drivers-use-hardware-acceleration
• disable protected mode in the Flash plugin (Flash 11.3+ on Windows Vista and later)
• disable hardware acceleration in the Flash plugin

See also:

• http://kb.mozillazine.org/Flash#Troubleshooting

Updating graphic card drivers solved the problem, many thanks!