Hi! In the meantime I figured out what made konqueror freeze whenever I tried to access any URL: kopete, which is automatically launched on startup on my box, requests a password from kwalletmanager and as long as I do not react on that kwalletmanger popup window will lead to the freezing konqueror problem.
Not sure if this is a bug in konqueror or in kwalletmanager though. At least the problem should now be reproducible for you! Best regards Christian Schoenebeck