Flash 10 launch problem on Mac

This issues appears to only be on Mac. The issue can be seen by going to http://www.icovia.com and clicking on the “Test Drive v5.0” button.
It should open a new tab or window with this page http://v5pcsdemo.icovia.com/icovia.aspx.

What happens is when the preloader is almost done, it gets stuck and just hangs there. If you go to the page directly there is no problem.

The problem only occurs with Flash 10 regular version. There is no problem Flash 9 and Flash 10 Debug versions.

Any suggestions are welcome.
Thank you.

I have heard a lot about problems with Flash 10, and that it has broken some backwards compatibility (accidentally). I don't know what to do at the moment but hope it is fixed soon.