This is not a bzr-gtk bug, though maybe you do want to work around it. You can simply reproduce this by the following sequence:
$ killall seahorse-daemon $ dbus-send --print-reply --dest=org.gnome.seahorse /org/gnome/seahorse/opengpg org.gnome.seahorse.Keys.Test
I've filed an upstream seahorse bug (linked to this report).
This is not a bzr-gtk bug, though maybe you do want to work around it. You can simply reproduce this by the following sequence:
$ killall seahorse-daemon org.gnome. seahorse /org/gnome/ seahorse/ opengpg org.gnome. seahorse. Keys.Test
$ dbus-send --print-reply --dest=
I've filed an upstream seahorse bug (linked to this report).