Hi David. Is there any reason you need multiple crossdomains on that site? This is the purpose of permitted-cross-domain-policies="by-content-type" attribute in the crossdomain master file. This will not allow you to load anything from the root site folder for example, unless it is another crossdomain file (this will permit loading other policy files from anywhere on this server though). This means you should load crossdomain file explicitly in your code. Read here for more info: http://www.adobe.com/devnet/flashplayer/articles/fplayer9_security_03.html
Best. Oleg
