I have exactly the same problem here. I've already tried the command defaults write com.blacktree.Quicksilver AppleLanguages -array German
but without any success. Is there anybody out there who is running Quicksilver under Snow Leopard without this strange behaviour (i.e. with localised commands and program and folder names)? It's a bit annoying to type "Desktop" instead of "Schreibtisch" or "Calculator" instead of "Rechner". thanks!
