Some images do not display when published, but do display using the HTML 5 Browser view. Why not?

I have a simple Captivate (Release 2017) project with several slides that contain images.  All images are .jpeg.   On six of the slides the images display when performing an HTML5 Browser view, but they do NOT display in LMS.  I tried deleting the graphics and then re-adding. That did not work.  I tried deleting the entire slide and then recreating – that did not work. Any suggestions?  I’m stumped!