Nobody know? I've searched, and found nothing on the web.
What I have found is that if I open Konqueror and TYPE in "file:" then I can TYPE the name of the drive or folder, and that will work. In fact, it will suggest a folder name, and clicking on the one I want from the suggestions, that will open. But if I click on the folder itself, I get - twice - the message that "KDEInit could not launch xxx."
Once I've typed my way down into the depths of subdirectories, the "Back" and "Forward" keys will move around the place, but the UP key gets me the "KDEInit could not launch xxx" again - twice.
The other strange behaviour is that, coming back to the machine after 8 hours, neither Samba Network Neighbourhood nor File Manager Super User Mode would work - both showed the bouncing icon for about half a minute, then disappeared again. I can open a root terminal and run them that way.
Have I got a Linux virus from somewhere, or what?