I have an curious issue when deploying a Flex application. Before posting, I searched some solution here : http://forums.arcgis.com/threads/13023-Issues-with-Deploying-Flex-App?highlight=swf+white, but it does not solve my issue. In fact, I use FlashDevelop and Flex SDK 4.6 and Flash Debugger, when I deploy locally or externally, no problem (thanks to Flash debugger, I guess), but when the client does not have the Flash Player Debugger, just the "normal Player", white page :the app does not launch, nothing. In other words, when the client has the Flash Debugger, no problem while he has not, white page (HTML and pictures launch properly).
Using Firebug, the SWF was found, Status 200, but nothing. I also use the API SWFObject to insert the flash objet correctly in the HTML page. I do not understand this strange behavior. I deployed many apps using Flash/Flex and I has never seen this issue before.