The default favicon location on your server gives a 404:
Your blogs homepage source-code related to linking to another location is:
<link rel=”icon” type=”image/png” href=”http://www.steve.doig.com.au/wordpress/wp-content/themes/grid-focus-public-10/images/favicon.ico”>
Note: The file suffix is .ico which normally stands for an Microsoft Icon file. But names are not interesting for that. The type="image/png" is correct here, it’s a PNG file.
Your blogs server does return the following mime-type header for that linked favicon:
Content-Type: image/x-icon
Note: That information is wrong. The file’s mime content type is acutally ìmage/png. Please reconfigure your server, rename the file to .png or convert the image in that file into the image/x-icon type (you can choose only one of these three options, the last one is the one I would do).
Suggestions
- Use a program that is able to properly save the microsoft ico file-format. Don’t use a PNG, use a true ICO.
- Place your favicon.ico file then into the root of your server.
- Modify the links’ href to the new location.
- Delete any old favicon.ico files from your server, delete your browsers chache, it’s history etc. . Then restart your computer. The old favicon should be gone next time you visit your page on that computer.
You’ll find more details in How to change the WordPress favicon?