I already went through the trouble that you can't put a Flash
stage otherwise you loose control over it (you have to keep
one pixel on
stage), but this is more tricky :
I suddenly had my Flash sprites working only in projector
mode and I
discovered that lower right corner of the stage was not
window was resized), which is where I hide my Flash sprites.
As soon as
I could see the corner, problem was gone in authoring mode !