Where is my WiseStamp signature?
Yahoo made an abrupt change to some Yahoo! Mail users which caused problems using WiseStamp.
We are working on a fix and will launch it ASAP.
Meanwhile, if you experience a problem, there is an easy fix. Log into Yahoo! mail with this updated URL: mg.mail.yahoo.com. When you login with this URL, you will able to see your signature at the bottom of your emails.