[Plugin: BP GTM System] no admin page in multisite install

On a multisite + buddypress install, the admin-menu was nowhere to be found. Not on the BP site admin page (siteid 3), nor under the BP menu (network admin page).

Plugin version: 1.0.1

I managed to get something working by changing some code:

On line 16 of bp-gtm-admin.php I changed ‘admin_menu’ to ‘network_admin_menu’.

add_action('network_admin_menu', array( &$this, 'on_admin_menu') );

Now it’s visible under the buddypress menu, but It’s still missing the right-hand-side metaboxes (as seen in the screenshot).

I rather not mess with the plugin code. Is there something wrong with my install, or is it the plugin that is not multisite ready?
Any insights greatly appreciated!

My install:
WP 3.1.2 + BP 1.2.8, Plugin version 1.0.1
BP_ROOT_BLOG=3

http://wordpress.org/extend/plugins/bp-gtm-system/