[attachmen t=1492:ecranproject1.jpg] Thanks to all, i have done all you said but unsuccessfully I send a file to explain my problem: See the file "ecranproject1.jpg" I have the effect when i preview on the window to configure the slide (point 1), but when i preview the project (point2), i have the effect on 2 slides and not on the other. I can not send my compressed example ? (2,93Ko) ??