I had to change my XOOPS folder, but keep XOOPS on the same server.
So I went to admin, switched the site off, checked that admins could still access while it was off.
Moved all the files, edited mainfile.php to change the xoops_root_path and xoops_url.
Now go back to http://www.mydomain/newfolder/index.php
Get the site closed message - Tried to login but it insists on trying to open http://www.mydomain/oldfolder/user.php

Eventually solved this by changing the siteclosed entry in the xoops_config table using phpmysqladmin.

Should I have done something different, or is this a bug?