I just read the release notes for Flash Player 11.4, which can be found here: http://labsdownload.adobe.com/pub/labs/flashplatformruntimes/shared/air3-4_flashplayer11-4_p1_releasenotes.pdf
In the section "Authoring for Flash Player 11.4" it's mentioned that we should use the 4.5.1 Flex SDK, and not Flex 4.6. "Download Flex 4.5.1 SDK (4.5.1.21328) from the Flex 4.5 SDK table." Does that mean that Apache Flex 4.8 cannot be used to author content for FP 11.4? Is there a technical reason why the 4.5.1 SDK should be used when you are targeting FP 11.4? - Raju