Hi, The problem is due to the last release of Firefox. It seems that only http:// and https:// url are now authorized to execute flash content.
The turnaround (on Mac OS). Removing firefox package from the application folder Removing the /Users/<user>/Library/Caches/Firefox folder Installing Firefox Extended Support Release version <https://www.mozilla.org/en-US/firefox/organizations/all/> Important : If "automatic update" was activated on your previous version of Firefox : disconnect your computer from the internet. install and execute Firefox ESR then go to preferences/advanced/updates and select "Never check for updates" to prevent firefox from installing newest version. It's a shame the way mozilla show respect for flash devs more than 2 years before flash EOL. Hope it helps. Vincent. -- Sent from: http://apache-flex-users.2333346.n4.nabble.com/