08:28 AM PST: Unable to log in to FTP using account owner’s Yahoo! ID
Some Yahoo! Web Hosting customers may have difficulties logging in to FTP using the account owner’s Yahoo! ID.
As a workaround, please create a new FTP user account in your Web Hosting Control Panel, Manage Tab, Password Manager link. Please see this help page on creating a new FTP user account:
http://help.yahoo.com/l/us/yahoo/smallbusiness/webhosting/pwdprotect/pwdprotect-03.html
12:22 PM PST
This issue has been resolved.