Hi kimwally,
This is their response:
Unfortunately we do not provide technical support for Linux operating systems. Our platform and charts, whilst compatible using most browsers, are not compatible with Linux. Given the many different versions and setups of Linux systems, it is not possible for us to provide support for this.
A good answer could be something like:
Dear Broker,
unfortunately we have to change broker because of lack of techical support for Linux ...

My only suggestion would be to try reverting back to a previous version of Flash, to see if this is perhaps compatible.[/i]
You can test this by running an older LiveCD say KDE-2011-06 ...
Additionally you could try to play with a few variables, like "browser identity", fooling the server to believe this is IE, or playing with other attributes, like HW acceleration, both on firefox and on flash plugin (right click on the flash video and turn HW acceleration off)
Not much info to provide something more than a guess ... good luck!
AS