[Dovecot] %d empty string

[Ryan Dotson]

I am trying to upgrade from dovecot 1.x to Dovecot 2.0.13 on Fedora.  My
problem is the mail_location setting seems to ignore the %d variable.  My my
location is as follows:

mail_location = maildir:/var/spool/virtual_mail/%d/%u/Maildir

However, when trying to log in the maillog says it can't
find /var/spool/virtual_mail//*myusername*/Maildir/cur.  As you can see it
just uses an empty string for the %d variable.  Can anyone help?

Thanks,
Ryan