Is there an upper bound to the size of a sprite in as3 / flash 10?
I know bitmapData has limitations...
I have some experience with Flash 6 and that was the 2880 x 2880 pixel limit with bitmaps.
When creating movieclips there was no problem having this 50000 pixels wide and zooming this e.g. 10x was no problem either.
So I guess you are pretty safe with anything other than the bitmaps which sometimes is a bit of a pain because of the file size restriction.