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
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