Your version of Flash is really out-of-date. Update your version of Flash. To do this, go to the Plugin Check site.

I've tried now with

Shockwave Flash

   Archivo: libfreshwrapper-pepperflash.so
   Ruta: /usr/lib64/pepperflashplugin-nonfree/libfreshwrapper-pepperflash.so
   Versión: 17.0.0.134
   Estado: Habilitado
   Shockwave Flash 17.0 r0

https://www.mozilla.org/en-US/plugincheck/ never ends of loading :(

Flash works fine both with Konqueror and with Chromium.

Any ideas?

Chrome cannot be use to test issues with Flash Player, as it comes with a built in flash player in it already. Firefox uses the Flash Player installed on your system.

Some problems with Flash video playback can be resolved by disabling hardware acceleration in your Flash Player settings. (See this article for more information on using the Flash plugin in Firefox).

To disable hardware acceleration in Flash Player:

1. Go to this Adobe Flash Player Help page.
2. Right-click on the Flash Player logo on that page.
3. Click on Settings in the context menu. The Adobe Flash Player Settings screen will open.
4. Click on the icon at the bottom-left of the Adobe Flash Player Settings window to open the Display panel.
   
   The image "fpSettings1.PNG" does not exist.
   
5. Remove the check mark from Enable hardware acceleration.
6. Click Close to close the Adobe Flash Player Settings Window.
7. Restart Firefox.

This Flash Player Help - Display Settings page has more information on Flash Player hardware acceleration, if you're interested.

Does this solve the problem? Let us know.

I've installed pepperflash, because Adobe no longer supports flash plugin for X86_64 linux platforms.

I've tried disabling hw acceleration with no success...now I have:

   Archivo: libfreshwrapper-pepperflash.so
   Ruta: /usr/lib64/pepperflashplugin-nonfree/libfreshwrapper-pepperflash.so
   Versión: 18.0.0.194
   Estado: Habilitado
   Shockwave Flash 18.0 r0

Problem persists

Adobe still supports the Flash player 11.2 esr branch for 32-bit/64-bit Linux with security and stability fixes. https://www.adobe.com/products/flashplayer/distribution3.html

The replies by Wesley Branton are more for Windows.

Thanks, Now using flash-plugin-11.2.202.491-release.x86_64.

Proble persists. It looks fine in Opera. If you can check for example http://streaming.deportv.gov.ar/# it would be great.

Thanks in advance