Shauno, your instructions worked for viewing gallery images on NextGen’s default Albums page. Now I’m trying to apply your guide to the related image thumbnails that NextGen can display below a single image in a post (I’m using tags to find them).
The controls for nggShowRelatedGallery() start in nggfunctions.php at line 710. I replaced the imageURL with ngg_custom_fields[“custom_link”] — where custom_link is the name of my custom field. However, this only links the thumbnails to the URL that I’m currently viewing.
This may be a more complicated hack than doing this for Gallery thumbnails. Thanks for your help! Here’s my site: michiganradiopictureproject.org