Imagevue is a complicated creature, with all elements stacked in depths and aligned so that they hopefully do not overlap or intersect even on different screen resolutions. The same goes for the preloader, as it is added outside of the image and may not display if the image takes full screen. How many kb are your images? Since imagevue preloads "next" image in line (while current image is being viewed), we did not deem it strictly necessary to have a visual preloader overlapping images. Especially in this day and age when a 250kb image loads in 1 second on most DSL+ connections.