Abrowser doesn't play films properly

Hello

I can't access a website for professional education (http://ilias.aekwl.de/goto.php?target=crs_27010&client_id=aekwl). It's made with html5 and flash films (for example: http://ilias.aekwl.de/ilias.php?baseClass=ilSAHSPresentationGUI&ref_id=27030) are not displayed properly. First, the window is black with a gray bar at the bottom that reads "click to play film" (German). Then, the window turns grey and nothing happens at all.

I use Trisquel 6.0, Abrowser 36.0.4 and Shockwave Flash 10.1 r999 Gnash 0.8.10. How can I fix it?

I hope the links work -- but they are probably password protected. However, in the help section of the website, there is link to http://html5test.com/ where Abrowser 36.0.4 which I use scores 424 of 555 performance points. However, I don't have a clue what that means and what the subscores are about.

It's important to me to watch these films. I hope I don't need to switch back to Ubuntu.

Thanks!

Florian