There's a bug that prevent to get the src of the images the second time a gallery is shown in IE7. You'll find this fix and more issue on next release. If you need to solve it now you have to change line 30:

from

  $(origGallery).find("img").each( function(){$(this).attr("srcx",$(this).attr("src"));});

to

  $(origGallery).find("img").each( function(){if($(this).attr("src")) $(this).attr("srcx",$(this).attr("src"));});