In ZD Beta 1 I could set up a POP account using smtp.att.yahoo.com and pop.att.yahoo.com hosts. On Beta2 account setup appears to parse the "yahoo" part of the host and force me to install a Yahoo+ IMAP email account. The email hosts referenced above are specific to AT&T's Yahoo broadband service, and are unrelated to Yahoo+ mail.
I dbl checked my email setup by cross referencing against the account setup for my Macintosh email client, and there are no errors in entry. The email account I have is a POP account, and the hosts defined above are accurate. ZD Beta2 won't permit this POP account to be configured, whereas Beta 1 would.