I've found some issues in the groupings/groups/members page. Here they are:
1) Each time I create a new group I get one PHP Notice about undefined variable at edit_form.php, line 26. I've examined code a bit and it seems that that line ($id = $group->id isn't needed at all. So +1 to delete it.
2) In my server I don't have GD installed, so I don't see the upload image interface. Perfect! But I see the "Hide image Yes/No" drop-down. Should be out too IMO.
3) After adding some members to a group, going back to the grouping/group/members page, each time I click over one group one "horrible" (IMO) icon is showed in the member list, rounding and rounding without end and the list of members isn't refreshed at all. Just wondering if this is an AJAX-dependent feature that isn't working properly, at least in my Safari browser.
And that's all for now... feel free to split this into smaller bugs if you find it necessary. Ciao