> This is by design: to save memory all Sprites share their images, so loading one sprite's image from a URL will update all sprites. If you want to use different images, add 10 or so empty animation frames, then you can load a different image in to each frame.
This information is so important, I didn't saw that on the documents!
I resolve my problem now
I agree with the poor documenation about "load spirte picture from URI" in the manual. If I hadn´t stumbled into this thread I would try to fix my map editor, that allows users to define background pictures in runtime for several more days before I would have given up.