Emoncms V9.9.8 It appears that at least several actions in the Post Process module create invalid Feed names. Actually the Feed name itself is fine it is just they are placed in the “NoGroup”. This “NoGroup” appears to be invalid as any Feeds within this can’t be graphed.
I have tested with “powertokwh” and “mergefeeds”.
I haven’t found any way to rename Nodes or move feeds to an existing Node, so it would appear the best fix would be to allow the selection of an existing Node as part of the Post Process interface.