Flash crashing when calling remote .aspx page

Has anyone had this issue and solved it:

Note, it only happens on my mac (intel 20" iMac, software full updated).

My fla calls a .aspx page which returns xml data for the site content. For testing purposes while in flash I call the file using the complete address… eg: www.site.com/getinfo.aspx . In Windows this works fine and stops me having to upload to test and saves time. On my mac when I try test like above Flash closes and gives me an error. I have this code in my AS:

System.security.allowDomain (“http://www.testsite.com/”);

Please if anyone has experienced this and knows how to solve it? I love my Mac I’d rather work on it.

Thanks