Are your groups public or private? If they are private read the FAQ of the plugin here: http://wordpress.org/plugins/mass-messaging-in-buddypress/faq/
I have public groups and they all appear in the list when I go to compose a mass message.
Hope it helps!
Public. You just type the name and it appears? Hmmm…. :-/
No the Groups and User Names are listed after the Subject and Message fields with a check box before the names.
Wow okay. This plugin doesn’t work at all for me then… I get a 404 at the mass messaging page [domain]/members/thomasbennett/messages/
When I go into the admin I also see a Stormation tab that wants me to log in…
[domain]/wp-admin/admin.php?page=Stormation
1.1.5 is out, should solve this!