would you mind to enter the issue in our public bugbase at bugbase.adobe.com?
please provide any steps, URLs and/or login information or sample code.
the issue may be security related as the other forum post mentions the fp 10.3 backport also experiences this. thanks...
We believe this is fixed in our Flash 11.3 beta 1 that was just released, if you get a chance could you give it a try? We're still looking into other workarounds that might be available for you.