If I change my theme in Gnome, the Keyring Manager doesn't accept my Passwords.

When you open a Programm requireing a Password Gnome-Keyring handles this. If it startsup first it asks for a Keyring-Password. From then, all Passwords of (at least Gnome-) Programms are stored in the Gnome-Keyring. Everytime you open a Programm with a saved Password you have to unlock the Keyring by entering your Keyring-Password. Every new Programms gets its entry in the Keyring too.

If I use other Themes as the Gnome default (Clearlooks) Gnome-Keyring doesn't accept any input anymore. If no Keyring-Password is set you can enter an new one, but it seems going to /dev/null and the requested Programm doesn't start (because Gnome-Keyring doesn't allow it).
If a Keyring-Password is already set you get asked for it at the start of every Programm having a Key in the Keyring. If you enter a Key, ist also goes to /dev/null and the Programm doesn't open or rejects access with a "Wrong Password" Promt.

Recieved error with Gajim, Evolution, Seahorse.