In order to understand the problem, I'd need to reproduce the problem. If you can provide me with a direct link that will allow me to reproduce the problem, that would be helpful.
If you need an account to reproduce the issue, I'd recommend that you reach out to the technical support people at telewebinars for more information. If they determine that the root-cause of the issue is a problem with Flash Player, they're more than welcome to file a bug, or send me a private message directly, and I'll help to escalate the issue.
In the meantime, I would recommend that you try a different browser, like Safari, Firefox, or Internet Explorer.
Thanks!