Malformed URL for trash with konqueror as default file manager

I always set up konqueror as my default file manager. But when I click on trash icon (e.g., on the desktop folder) I always get a "Malformed URL" pop-up with KDE 4.5.4. Is there a fix for this? My configuration on another machine running kde 4.4.x works OK for trash and I don't see any significant differences. If dolphin is default fm, click on trash works fine. Thanks, -gene