Hello,
Hope this saves someone else hours of troubleshooting…Enable Media Replace 3.3.8 has a bug which wipes out ACF’s serialized content for the field posts ACF creates. The issue only occurs when using the search and replace feature with non-image based media (PDF, etc).
The solution is upgrade the plugin to 3.3.9. If you already broke your ACF fields then you need to restore the DB, or export working ACF groups, trash the broken fields, and import.
Thanks
Thanks for giving everyone a heads up