Hi Jordy, thanks!
I think I discovered the plugin that caused the problem, it was ACF – Advanced Custom Fields PRO.
I got this notification today: “Important note about the following plugin(s): ACF. They require additional checks which are implemented in the Media Cleaner Pro.”
If I buy the pro version of your plugin will I be able to delete the images without any problems? How can I be sure of this?
Thanks,
Paulo