I think we covered every possible cause in this super long thread. I asume you have the latest flash player installed right? You might want to try with different browsers/platforms. Sometimes the flash player is broken on one browser and working in another.
I am also sure that it would take me much less time to fix the issue myself by logging into your machine than the time it takes to write all of these posts! Try to catch me via the live help tomorrow... if you can give me ssh access to the machine I will be able to at least test the install and probably make it work in a few minutes.
Best regards,
I am using trhe same browser I am using to connect to the working trixbox server. I willbe happy to give you access.
I would need you IP via pm or email and I will send you the password