Ajax not working for logged in users

Probably it’s because of this:

add_action( 'wp_ajax_my_action', 'my_action_callback' );
add_action( 'wp_ajax_nopriv_my_action', 'my_action_callback' );

You have to add the action for both hooks. Probably the plugin is hooked to the second hook right now.

You can read more in the docs.

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