NextGen gallery shortcodes not working
One of the filter that deactivates all the shortcodes in the nextgen gallery breaks nextgen shortcodes whenever there is the_content hook involved within any other shortcode that is on the same page as NGG shortcodes. This will happen to any theme that has this kind of shortcode which involves fetching post content from any post type.
To fix this, nextgen gallery plugin core files will have to edited and maintained to remove this filter until NGG adds it to the core.
Edit wp-content/plugins/nextgen-gallery/non_pope/class.nextgen_shortcode_manager.php, find and delete the following code: