Added a new hosted repository. The repository did not show up in the list of repositories when a new group was added.
Hitting refresh did not affect the results at all.
Stopping/restarting the Nexus server allowed the repository list to be seen with the new repository listed.
Some of the UI screens don't always refresh, the repo maint screen refreshing has been completely redone in beta-3. Usually though closing the tab and reopening it will force a refresh.