help needed : Nvu, KDE, Qt

I have a big problem in my Nvu build based on the Firefox 1.0 codebase : I want
its sitemanager to display KDE default mimetypes icons for the files. So I
added this line to main() :

   KApplication myNvuKApp(argc, argv, argv[0], false, false);

and I have somewhere in the code a method calling KMimeType::iconForURL().

But at launch, the application often stops and restarts, to create the first
profile, to disable extensions, and so on, and KApplication() does not seem to
like it at all.

Any suggestion ? It would be terribly depressing to remove that from the app...

</Daniel>