I tried to install this plugin (I install in my DIVI theme) and changed the “gallery-dop-thumbnail-gallery.php @line 41 file ” but after differents tests I see nothing in my dashboard that change!!
[nggallery id = 5 template = dop-thumbnail-gallery] works but that’s it!
Problem solved. This happens because the NextGEN cache. After each change made in the template or you delete some image, save and then go to WP Admin – > Gallery -> Other Options -> Miscellaneous -> Clear image cache , the changes will appear on the site.
Please check: http://www.relookingphoto.com/site_2015/