The Flash player has a security sandbox that disallows loading data (a swf) from other domains, including subdomains. To get around this, install a crossdomain.xml file in the web root:
<?xml version=”1.0″?>
<!DOCTYPE cross-domain-policy
SYSTEM “http://www.macromedia.com/xml/dtds/cross-domain-policy.dtd”>
<cross-domain-policy>
<allow-access-from domain=”*.mywebsite.com” />
</cross-domain-policy>
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