Using a WYSIWYG field on at Attachment form causes a javascript error and prevents the saving or inserting of an image, rendering the form useless. Sometimes I can insert an image if it’s the first time using the form on a post or widget, but editing an image always causes the error.
Wordpress: 4.0.1
ACF: 5.1.5
Hi,
This may be a plugin conflict problem.
Try deactivating all the other plugins and see if the problem persists.
You may also want to update to the latest version of the plugin.