Thanks, Andrea.
Now, without even making changes, I can’t get to the site admin page. I must have messed something up on the install, maybe the .htaccess file, because the problems keep getting more and more strange.
Why can’t the WP 3.0 package just come with the proper .htaccess file? I just created a text file, copied in the lines from the tools->network instructions and renamed it after transferring to the server, via FTP.
I’ll try, once again, to scrap the whole thing and reinstall. I hadn’t done anything with it yet, anyway.