Dept asked to have a sub-item added to one of the menu items on their home page (i.e. a "summer courses" item to the courses offered menu). When I added that, the images for the subsequent sections disappeared from the page, but all the code worked properly. Investigation showed that any change to the menu sub-items causes the images for subsequent menu items to disappear. Greg and Martin helped a bit on debugging. I wrote to Clifton as he edited this site a bit over the summer and may have a better idea of what's going on.
Also made a couple of other trivial changes to the site without consequence.