I just installed the latest version of WP-MU (sub-directory option) on a Dreamhost server. No error messages. After the installation, I was unable to log-in. I eventually figured out (sheer luck) that manually adding "/blog" to the URLs after the domain name sorted it out.
URLs of the form:
my.domain.com/blog/wp-admin
worked, whereas
my.domain.com/wp-admin
did not work. I don't remember specifying "blog" anywhere during the installation and would like to use WP-MU to server the home-page of the site (without the need to insert /blog into the URL).
All links at the default blog at my.domain.com point to the wrong places.
This is not an issue for future blogs set-up on the server, which can live without the /blog addition. For example, I created a new blog at
my.domain.com/blogname
This is my first real WP MU attempt, so this could be something very obvious (but not so obvious that I found it in the forums). Any help appreciated!