This article applies to:
A black box is displayed in the location an Echo is defined when the previous object is a Slide with a SlideButton, SlideChoice, SlideSlider, or SlideMovie with PreRelease enabled.
Additionally, this occurs when the previous object is a MovieDisplay with PreRelease enabled.
This can occur when there is interaction with the SlideButton, SlideChoice, or SlideSlider. The SlideMovie and MovieDisplay require no interaction for the issue to occur.
Set PreRelease to 0 on the MovieDisplay or Slide.