After making a group you want to invite other portal members to join it. Then I click the "Invite Members" link at the buttom of my group. This brings me to the "Select User to Invite" page. This page show no users. Non at all. 

I've double checked that the module has its default values in the "Group Member Display", the "Group Member Request Display" and the "Invite Group Member Display". Still no users to invite.

Also while looking at a group, it's not showing any members in the group, not even the owner. In the first sceario it just says: "Sorry - no users found..." and in the second (on the group details page) it says: "No Group Members...".

Funny thing is, it all worked yesterday, today it doesn't... Why, what did I do?

DNN Vers. 4.8.2
Group Module vers: 4.3.5