Please try this, edit the file /plugins/content/plugin_photogallery/js/jquery.lightbox-0.5.min.js
Find five image links and change them, in example, from:
Code:
'plugins/content/plugin_photogallery/images/lightbox-ico-loading.gif'
to:
Code:
'http://qpgcm.apple-point.eu/plugins/content/plugin_photogallery/images/lightbox-ico-loading.gif'