Closed the door, Podz. They’ve ‘identified’ the source as being the root index.php in my installation. If you look at the site you get ‘No input file specified’ in FireFox. IE gives you nothing.
The whole thing sounds preposterous! I’ve been back and forth by email, but getting nothing useful in response. “Try contacting the authors of wordpress for a patch” was the latest stunning advice. I’m on version 2.0, for crying out loud!