How do I get PySide QWebView to display all images

Question

The simplest PySide app shown below with a QWebView is showing webpages which have many but not all images missing. It is not consistent on whether it's gif, pngs or jpgs that are causing the problem. It might be something to do with the size of the image that is being downloaded.

from sys import exit
from PySide.QtGui import QApplication
from PySide.QtWebKit import QWebView, QWebPage

app = QApplication([])
webview = QWebView()

webview.show()

webview.load("http://bbc.co.uk")

exit(app.exec_())

My environment is a PySide=1.1.2 installed using easy_install into a Python 2.7 virtualenv running on a Windows 7 machine.

I looked for a setting to do with the size of images in the cache, which was one of my suspicions, but I can't find anything. The rest of the page loads correctly, including all the js and css parts.

Any advice as to what could be wrong here would be greatly appreciated.