From Macromedia TechNote 16389:
"The Macromedia Flash Player does not have a decompressor for progressive JPEG images, therefore files of this type cannot be loaded dynamically and will not display when using the loadMovie action."
From Macromedia TechNote 16389:
"The Macromedia Flash Player does not have a decompressor for progressive JPEG images, therefore files of this type cannot be loaded dynamically and will not display when using the loadMovie action."