Adobe is planning to release a security update for Flash Player 9 next month (April 2008). Adobe informed Facebook that this update can potentially break Platform applications that use Flash.
If any of the following situations apply to your application, then your application could be affected by the update.
This security update also includes the second phase of their implementation for authorizing socket policy files.
You can read the full article about the update at the Adobe site:
http://www.adobe.com/devnet/flashplayer/articles/flash_player9_security_update.html