Our studio is currently facing the same issue and we are working on pinpointing the source of the problem.
To help solve the issue, we will need more information:
– ACF version
– WP version
– Installed / Active WP plugins
– Installed / Active WP themes
You can do some general debugging as well:
– Does field data save if you have a default theme (TwentyFourteen) active?
– Does field data save if you disable ALL other plugins?
Here is a sample report for our current debug site:
* Core: WP v4.0
* Theme: Enfold 3.0.1
* Plugins:
- Admin Columns 2.2.9
- ACF Pro 5.1.3
- Duplicate Post 2.6
- FacetWP 1.4.3
- Gravity Forms 1.8.19
- iThemes Security 4.4.23
- Publish and Redirecto To Add New Post 1.5
- Really Simple Twitter Feed Widget 2.5.11
- Redirection 2.3.10
- SearchWP 2.3.4b3
- WordPress SEO 1.6.3
