I'm seeing a lot of 404 file not found errors for fancybox images for example /fancybox/fancy_shadow_n.png -- it looks for the image in the current local directory instead of in the plugin folder.
Seems this is an issue with the Fancybox package and IE image references. See http://wordpress.org/support/topic/404-errors-from-20-png-files?replies=8#post-5734106
Would be nice to have this sorted out for a future plugin release. Thanks!