I have noticed that the config setting DPU_SHOW_LOADING_IMAGE (true to show a small loading graphic so the user knows something is happening) is misleading as if you set it to false the whole functionality is not loading anymore. There is no image loading but no price change as well :-) If the graphic is needed it would be better to remove this setting. If the graphic is not needed something must be wrong in the
Code:
 <?php if (DPU_SHOW_LOADING_IMAGE == 'true') { ?>
sections.