My pop access has stopped. I found a notice that Yahoo was going to need to shut down some access to email?

for some users overnight until 6PST in the U.S. two days ago. But before I discovered the notice I mistakenly thought that my pword had been invalidated so I changed the pword. Now I can once again access my email on line but not through POP. I have had uninterrupted POP access (using Eudora) for years and I have Yahoo Plus. What can I do to restore the service? My entire operation is geared toward POP access and down and up loading everything instead of working on line. Help is most appreciated.