Bug? Slideshow time is wrong

When I combine several images to create layers, which shortens the slideshow, the bottom information bar does not decrease the total slideshow time. Is there some other place where FM shows the accurate length? Right now FM tells me the slideshow is 16 minutes but it actually takes just 12 minutes to run.

Normally FotoMagico recalculates the length as soon as you select another slide in the timeline/storyboard. Does this work for you?