It might happen that some of your photo placeholders are suddenly yellow with red crosses in them. This indicates that the software cannot find the image that was placed in the photo placeholder anymore. This occurs when the photos are no longer in the album file of your photo book. Each time you place a photo within the photo book, a copy of the photo is saved within the album file of your book. If this copy is no longer within the album file, the software will show a yellow place holder with the text "Missing picture" in it.
In this case, we advice you to contact our customer service. We are happy to help!