Is it correct that the slideshows limit is 400 seconds and all images after 400 sec are not displayed?
That doesn’t depend on the time, only on the number of frames: “…a Flash movie can have up to 16000 frames.” (“The magic number”) Here is a simple calculation: 16000(max. frames) / 30(fps) = 533 (sec) If a slide is shown 4 sec and effect 1 sec then: 533 / (4+1) = 106 (slides) So you can use either 106 slides with the fps=30 or more slides with less fps.