This is happening to me as well ~ I am using Helya's update, I think. Makes the info a bit useless. I am disappointed too.Hmm, the trick of looking up a player, view their city, and exit to world map now returns me to my city, instead of the exiting city like before. So I can't see where those players above are located without scouring the map.
Edit; Well, I can find Knucklehead13, I can see the city, but when exiting it returns me to my city. This does not happen for other players, including other undiscovered players. So suggests Knucklehead13 has been moved off the map? But then why do I get a result for the city?
I went and got one for US4:
@helya some of the centers have been ignored long enough that we can't find them again.
US1 center is still Sandles25, same as my last check on Dec 28, and DocPablo is still lower left of center, for whenever the baby city at the center gets deleted. And considering it has been there for a month now and not changed any, have the moves stopped for now?