I am also having this problem with ZA. In fact, I think I am experiencing two separate bugs but am not sure if they are linked;
1.) When I have Zonealarm active I just cannot sign in, getting the "service is unavailable message".
2.) When I disable ZoneAlarm I cannot login but get no error message, see
http://shoutbox.menthix.net/showthread.php?tid=63...d=696296#pid696296 .
I was getting problem 2 but not problem 1 before I signed up for the yahoo interopability BETA, since doing that I am getting both.
ARG!
