I was trying to move a child site to the root directory (under htdocs, the folder that contains wp-admin, wp-content and wp-includes directories).
I changed the blog's URL to domain.com and the location to / in the network admin settings and then tried to move the files:
I made a back up of the root folder mentioned and then copied all of the directories and php/css files from the theme directory I wanted into the root.
This didn't work (obviously?) and I had to revert the changes I made in the dashboard. I restored the files that were backed up, but now all of my child sites at domain.com/child are giving 404 errors.
What got messed up exactly? Thanks in advance.