Just made my first Animatics test album with jAlbum 23.1. Looks great. Went back in and added a short .mov file. I couldn't play the clip in the album as I couldn't initially see the play icon. Somehow after going full screen and back, there it appeared and clip played as expected.
Even without testing it, I knew what was happening! And a quick test confirmed it. The problem occurs only with the "Ken Burns" transition type, because that one doesn't always show the entire image. With a video, the video controls may become inaccessible - in my little test album, I couldn't get to the controls, no matter what I did. See Animatics > Lightbox > Main image > Transition.
I was just thinking something like that - if the Ken Burns effect has been selected, don't include videos in the album (maybe actually exclude them from the project?), and pop up a little dialog box about it.
While I never verified nor knew why, it crossed my mind after posting that Ken Burns may have been the culprit here. Ken is the default action on the skin so if there is no way to move the controls inward from the margins, then I agree there should be an alert when a video is involved.
In the Lightbox section, there is an option box to "Auto start videos." This does not work. I understand today's browsers don't allow videos to just start playing, but nonetheless, the box doesn't add anything.