(using ACF Pro Versión 5.3.1 and WP 4.3.1).
I´ve a problem with get_field and a Gallery Field. Steps to reproduce it:
-Fill a Gallery field using
update_field( 'galeria', $ids_img_galeria,$post_id);
Where ‘galeria’ is the name of the field and $ids_img_galeria is an array of attachments ids.
-After doing that, i can see images properly on the field on the WP Admin.
-Then if I use get_field(‘galeria’) to get all the images, i get something like:
0 => int 1960
1 => int 1961
So, instead of an array with all images metadata i´m getting just the IDs os the images.
If i manually save the post on the admin, get_field(‘galeria’) starts working properly.
When updating a field that does not already have a value you need to use the field_key instead of the field value. There is more information on using field_keys in the documentation for update_field http://www.advancedcustomfields.com/resources/update_field/