Couldn't change keyring password

Status changed to 'Confirmed' because the bug affects multiple users.

le trousseau de clé me demande le mot de passe 'default' à chaque connexion.
j'ai suivi la méthode suivante pour m'éviter de taper ce MDP à chaque fois:
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"Dans préférences tu trouvera l'outil "mot de passe et clés". Tu fais un clic droit sur "mot de passe : default", tu selectionne "modifier le mot de passe". Tu entre ton mot de passe dans "ancien mot de passe".
Tu ne rempli pas les deux champs suivants et tu valide. Une fenêtre d'avertissement s'ouvre et tu choisis "utiliser un stockage non sûr. Voila, normalement au prochain démarrage plus de fenêtre de demande de mot de passe.
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mais voila, une fenêtre s'ouvre intitulée: Impossible de modifier le mot de passe du trousseau

Method "ChangeWithPrompt" with signature "o" on interface "org.gnome.keyring.InternalUnsupportedGuiltRiddenInterface" doesn't exist

dois-je supprimer le trousseau et puis-je le faire sans risque. car un message annonce: Voulez-vous vraiment supprimer le trousseau de mots de passe « Par défaut » ? , je comprends que tous les éléments vont être supprimés définitivement.

I confirm the problem.

I can confirm this problem, too, on Mint 14 (Nadia) with Mate desktop 64Bit.
The "login" keyring didn't exist, creating it has no effect. I had one called "default", one named "Vorgabe" (which is a German term for "default") and one without any name. When creating new keyrings (like "new", or "login"), I can assign a password of free choice, but I won't be able to change these afterwards, producing the erorr message mentioned above.
On the other hand I'm able to delete the keyrings completely, while
a) you only see that deletion did take place after restarting "seahorse"
b) the empty-name keyring stay even after deletion/restart and disappears after seconds attempt.

I deleted all password keyrings (I know the PIN of my UMTS-SIM by mind, the other could only be for login),
knowing I might possibly not be able to login.

After logoff/logon (successfully with password prompt), I was not asked for a keyring password anymore!
WLAN was connected immediately, and I was able to start the UMTS connection at once.

I shut down my computer and rebooted, and as expected, no keyring prompt.
So for me, this seems to be no problem anymore.

In "seahorse" a new keyring with no name, unlocked and wihtout any stored passwords appeared.
(Not sure, but I think it was already there after lo/li.)
Context menu entry "set as default" (or how it is in English version) is greyed and can't be chosen,
and the passwrod can't be changed (same error as m.a.).

At the end there is only one point: why did I ever have to "use" a keyring?

I confirm this problem too on Mint 15 Mate (Olivia ) 32bit for seahorse_3.6.3-0ubuntu1_i386 and seahorse_3.8.2-0ubuntu1_i386.

Seahorse show two keyrings:
- a empty keyring with no name
- a 'default' keyring

To try change password for 'default' produce error:
Method "ChangeWithPrompt" with signature "o" on interface "org.gnome.keyring.InternalUnsupportedGuiltRiddenInterface" doesn't exist

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