Sounds like you're seeing a lot of missing images, like:

If I entered the proper URL for the image, you'd see:

This could be the result of a badly configured webpage, your system having problems resolving the server the images are hosted at, or your system is configured to block access to the image server (probably with the HOSTS file).
You'd need to find out more about exactly what images aren't showing, by right clicking the broken image and selecting properties. See if you can find a pattern as to why it's happening.
Hope this helps
