Why can't I watch videos from CTV, but other sites are fine?

Recently i had a similar issue. I update firefox to version 16.0 and flash player to 11.4.402.278. After that i still could view some flash videos like on you tube, but some other sites didn't worked. (e.g. myvdieo.de) Even the version check on adobe's own side didn't showed anything. Where the version flash file usually showed up, only a white space appeared. However the right click menu was still available, it just don't let you enter the settings menu.

(http://helpx.adobe.com/flash-player.html)

So far i couldn't fix this by updating or reinstalling older versions of flash player. I tried 10.3.183.29 and 10.2r152. All showed the same strange bug.

Even disabling the hardware acceleration inside the flash player menu won't helped. (This menu could be accesed on working sites like youtube)

But i found another solution. My notebook has two graphic cards. A nvidia geforce 520M and a the CPU integrated GPU of a Intel i5-2410M. Nvidia calls this optimus technology. In System settings (Nvidia Control Panel) i can choose which graphic card is used for what program. By default i've set it to use the nvidia card for all programs by default. Thus it is used for rendering firefox as well.

As soon as i forced firfox to use the Intel graphics card everything works fine. All videos are working and adobes version check worked too.

So basically this optimus technology doesn't seems to work with the latest firefox - adobe flash combination.

(Blocks firefoxs rendering the output from flash player, when beeing rendered on nvidia ??)

Maybe you have a similiar configuration.