I went and looked for any orphaned nodes/groups. None.
I had to do some magic to get the groups to move from one dashboard tab to the other.
The dashboard tab/screen couldn't be deleted or renamed.
If I renamed it to something else, all the groups on it would be orphaned.
I had to make a new tab (in/on the dashboard part) and name it what I wanted.
Move/drag the groups form the existing tab to the new one then that tab could be deleted.
So to re-state:
I had a tab (dashboard term) who's name I wanted to change.
If I renamed it, this wasn't reflected in the right column.
But then when/if I DEPLOYED, all the groups would be ... orphaned.
Dragging groups between tabs caused similar problems.
The only way I could rename the existing tab was to make a new one then drag the existing groups from the old to new one.
Then I could delete it.
And sorry those links were all spacer groups.
No offence. But my groups had active objects in them.