If you resize images and what them to show using lightbox & cmpfetch you need to change the image name on the page where you have fetch installed.
Normally it will look like this -
"linktemplate"=>'
http://yourdomainname.org/gallery/albums/{{pFilepath}}{{pFilename}}"rel="lightbox"');
Change to this - "linktemplate"=>'
http://yourdomainname.org/gallery/albums/{{pFilepath}}normal_{{pFilename}}"rel="lightbox"');
Change the bold to what ever the new resized image file names start with - in most cases it's resizing will place "normal_" at the beginning of the image file name