Accodring to this Dreamhost Wiki Article regarding Frontpage use on Dreamhost, “You also CANNOT use CGI scripts with Frontpage Extensions!”.
PHP, running under suexec on Dreamhost, uses PHP as a cgi to run PHP code; I’m surprised that the WordPress install works at all.
The article also goes on to say that:
[quote]Thus, when we enable FrontPage for a domain, everything for that domain must be owned by dhapache (the user that Apache runs as). There is no way around this.
If you enable FrontPage extensions for your domain, you will no longer be able to edit files outside of the FrontPage program, and you won’t be able to publish, delete, or move stuff via a shell account or FTP. [/quote]
In short, it is “Frontpage” alone, or “no Frontpage, and everything else” Dreamhost has to offer.