I just installed 4.7.6 and have imported contacts into groups. When I go to manage groups, child groups do not display. When I go to send a new mailing, child groups are listed but don't seem to be connected to parent groups.
My experience on 4.4 and 4.6 is that when I first go to Manage Groups the child groups are hidden under the parent group. I need to click on the arrow to the left of the parent group name to see the child groups.
Is it different on 4.7.6?
This is a known issue which had not been resolved as of October 24, 2017.