If you see at that title and know what I am talking about, then you know my pain. Almost 2 days of work down the drain trying to figure out why the project I was working on worked fine in 9.0.115, but not any version earlier than that in Firefox and Safari.
Long story short, I stumbled across this tech note :
The plugin version of Flash Player does not fire flash.events.Event.RENDER when wmode is set as transparent. (198515)
which led me to this post from Jesse Warden about fixing the CS3 components. Made the changes he spoke of in the article (except I didn’t delete the component shim, i just added a new fl.core.UIComponent to my class path) and everything worked fine again. Joy.
Yeah, I learned that after a week, very frustrating.