Mintupdate's windows does not appear

[davidMint]

I have made a fresh install of Linux Mint 13/Kde.
Nothing was wrong during this install.
But when I click on the "mintupdate" icon (to update...), the first windows which ask to enter the password opens, and nothing after...
If I launch it in a terminal, here is the answer :
QInotifyFileSystemWatcherEngine::addPaths: inotify_add_watch failed: Aucun fichier ou dossier de ce type
QFileSystemWatcher: failed to add paths: /home/david/.config/ibus/bus
mintUpdate.py: Fatal IO error 11 (Ressource temporairement non disponible) on X server :0.

Actually, one year ago, with a differetn computer, I have got the same problem without answer :
http://forums.linuxmint.com/viewtopic.php?f=34&t=109202

What can I do to fix that ?

[timvb]

Me too. I get asked for the password then... nothing.