Also – from what I can see – it looks like a security/access issue – the URL with a demonstration of what’s happening is
http://groritetrees.com.au/?p=1
And the link to the image within the source on this page is
http://groritetrees.com.au/wp-content/uploads/2011/08/aaron-concept2-300×246.jpg
When I go directly to this link – I get a Forbidden error – and an additional “Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.”