In FP 10, bitmaps are no longer restricted to a max size of 2880x2800. Now
they can be 4096*4096 with a max of 8192 for any dimension.
Flash authoring has always, and still, restricts the stage size to 2880x2880.
So that's not ideal.
Those are the facts. If I get a few more requests I'll technote this.
My question is really how large does the flash player support scaling
content?
If I have a swf that I created in the IDE at 100x100 and then I open it in the
player and tell the player to scale to 5000x5000 it appears that FP 10 doesn't
complain. FP 9 and earlier did complain by not rendering content past a certain
pixel boundry.
Flex seems to have an issue if you have a gradient set on the mx:application
component (I haven't tested others yet), which is probably the issue with the
4096 single bitmap boundary.
The crux of the matter is that I am getting artifacts on the screen when I
scale the player to a very large size that has a flex swf loaded. The artifacts
are not part of any content that I load. So either they are caused by the flex
framework components or the flash player itself.
You should open a Flex support case and provide some samples. Flex support
guys can then write a bug..