Although the plugin was written to shine within a network environment with cross-site search and cross-site posting, the network features are not guaranteed to work for self-hosted users.

To clarify, most network-level features are not included in this code at all, as they are currently too heavily tied to the WordPress.com infrastructure/codebase.

This is best thought of as a "developer only" release of something that works roughly, on a single WP installation. I would not recommend running this on a production site unless you know what you're doing, and are willing to tinker/optimize/tweak things to your particular environment.