Re: group invite problem
Had the same problem, till I realised that users need to have entered a name into their profiles. If only their usernames are visible (which they use to login) they will neither show up in the list of members on the site nor appear in your list of friends when you create a group.
Could also be an issue if you use IE, the following settings need to be activated:
Active X controls and Plugins
1. Allow scriptlets (Enable)
2. Run activeX controls and plugins (Enable)
3. Script activeX controls marked safe for scripting (Enable
Scripting
1. Active scripting (Enable)
Worked for me at least, cheers
