Reading https://bugs.launchpad.net/ubuntu/+source/gnome-keyring/+bug/339097 it looks like gnome-keyring is acting as the ssh-agent, so maybe the problem is with that rather than seahorse.
Roger
Reading https:/ /bugs.launchpad .net/ubuntu/ +source/ gnome-keyring/ +bug/339097 it looks like gnome-keyring is acting as the ssh-agent, so maybe the problem is with that rather than seahorse.
Roger