Server side configuration for Flash

If your presentation files are served from a different domain than the rest of your site then it is possible that Flash security settings will restrict access to these files. This might cause that 360 presentation doesn't work with Flash. 

In this case, you’ll have to create the special file called crossdomain.xml and make it accessible from the the domain hosting your presentations, e.g. http://yourdomain.com/crossdomain.xml. The content of crossdomain.xml file should be as follows:

<cross-domain-policy>
  <allow-access-from domain="*" secure="false"/>
  <site-control permitted-cross-domain-policies="all"/>
  <allow-http-request-headers-from domain="*" headers="*"/>
</cross-domain-policy>

Make sure you have configured your server properly for HTML5