Hi @dkuzmicki
did you use MU Manager to delete advanced-custom-fields-pro.php, or only to deactivate it?
I mean, you clicked on “deactivate” and then the mu plugin disappeared, or it disappeared because you clicked on “delete”? In the second case there are no bugs.
In any case, to solve the issue try these steps:
- Via FTP go to the folder wp-content/mu-plugins
- Look for a file that looks like advanced-custom-fields-pro.disabled-66df3c665fd24 or advanced-custom-fields-pro.deleted-66df3c665fd24
- rename that file to advanced-custom-fields-pro.php
The code 66df3c665fd24 is just an example. You will see a different code.
If you can still see the page of plugins, another way to solve the issue could be deactivating Advanced Custom Fields PRO and activate it again. By doing that it will probably write again its mu-plugin to the folder wp-content/mu-plugins.
I hope it helps. If you stil have issues let me know.
Have a great day!
Jose