Stream only playing sound (no video) in latest Mac browsers?

I built an app using SMP 1.6.274 inside Flex Hero targeting Flash 10.1.102.64.
The  app ran fine in an OSX 10.6.7 running Firefox 3.4, but not Safari 5.05  or Chrome 11.0.696.65 on a Mac: the stream plays only sound and shows no  video.
I installed the latest version of Flash Player  10.2, on the chance that there was a conflict with the older Flash  Player and the newer Chrome and Safari browsers, but that didn't solve  the issue. I then downloaded Firefox 4.0, and it also plays only the  sound.
So I tried to install Flex 4.5.20967, the latest  build and target Flash Player 10.2, but ran into a number of problems  (mainly losing the connection to the spark.components.Application), so  rebuilt the application back around Flex Hero, but still have no video  on all three Mac browsers.
I verified that everything is working fine from the FMS server by running older players.
I am not sure what else to do at this point and am wondering if someone can point me in the right direction.
Thanks.

With Flash Player 10.2 the new StageVideo API became available. Using this new API enables hardware accelerated video rendering, boosting video performance and reducing CPU usage.
In the latest OSMF builds (starting with the OSMF 1.6 Sprint 1 build) support for the StageVideo is enabled by default.
What you've experienced it's a known limitation of using OSMF or SMP in a Flex application, where the video is shown behind all the Flex components.
To make your video visible, you have to set backgroundAlpha=”0″ for your mx:Application or other flex containers of your video.
Alternatively, if you don't want the performance boost you get from using StageVideo, you can disable it and your app should work as expected.
Here's how you do that: OSMFSettings.enableStageVideo = false;
As for your latest post, Chrome has it own version of Flash Player bundled with the browser and it manages the updates by itself.
I suspect you still have 10.2 installed in chrome. Use Chrome to visit this link to learn what version of Flash Player it's using: http://www.adobe.com/software/flash/about/
I hope this helps!

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