I am using the latest version of ACF Pro and when I select a Category or a custom taxonomy on a post, the ACF fields disappear. All the data entered into those fields also doesn’t save once they’ve disappeared. I’ve looked at the older threads here that have some work arounds, but they don’t seem to working anymore. I’ve also tried switching to the latest free version of ACF but no luck there either. Any help would be greatly appreciated!
When this happens it is usually an indication of a PHP error during the AJAX that fires when you select a category or term. The first thing to do is to deactivate other plugins. You need to track down where the error is happening and this can be difficult during AJAX requests. You’ll need to turn on error logging, see this for more information https://codex.wordpress.org/WP_DEBUG
Okay turning off the WPML plugin makes it work fine. There is nothing in the debug log though. Another interesting thing is that is only breaks for the secondary language. Everything is fine when editing any primary language post. I don’t have the option of keeping WNPL disabled, the site HAS to be multilingual! Do you have any idea what could be causing this problem?