I am really, really new to WP, and have come across the same problem after install…
From the previous solution offered by James, in the table called ‘wp_usermeta’ I added a new row called ‘wp_capabilities’ and entered in a:1:{s:13:”administrator”;b:1;} and updated the ‘user_id’ using PHPMyAdmin…it seems to be working fine now.
It does look to be that this version of the WP 3.1 Dev Suite table structure might be missing a row on installation.
However, the information offered by James initially really helped me figure out what might be the issue. Thank you!