New problem with AT&T mail

I have been using getmail for AT&T email for a few years without
problems, but starting last evening we had this error:

att: operation error (IMAP error (EXAMINE command error: BAD ['[CLIENTBUG] EXAMINE Command is not valid in this state']))

I assume this is a problem with AT&T rather t han getmail, but thought
to mention it here. This is the relevant rc file:

*----------------------------------------------------------------------*
[ATT]

[options]
# Print status messages to stdout
verbose = 2
# Time out POP3 connections after 5 minutes
timeout = 300
# Only retrieve new messages
read_all = false
# But don't delete them from the server when we're done 
delete = false
# Log retrieval and delivery here
message_log = /home/eperea/Log/getmail

[retriever]
type = SimpleIMAPSSLRetriever
server = imap.mail.yahoo.com
username = [username]@att.net
password = [password]

[destination]
type = MultiDestination
destinations = ('~/Mailbox', '~/Maildir/')
*----------------------------------------------------------------------*