<p>I asked a friend about this, and he said it's possibly an issue with the server, or the way the images were uploaded.</p>
<p>If you run "wget -S [image URL]" from the terminal in Linux, it prints out information about the image, specifically the Content-Type.For the Wikipedia image above, the output was: "Content-Type: image/png".For the blog image above, the output was: "Content-Type: application/octet-stream".</p>
<p>For some reason, the images on your site are being treated as applications and hence are wanting to be downloaded, not opening in the browser.</p>
<p>Note that this also applies to .jpg images on your site, not just .png images.</p>
<p>Further note, it seems this only applies to images within, or attached to, nodes; not images as part of the design/layout (i.e. the projector and OLP.org logo in the header work fine)...</p>
<p>Peter Andersonwww.panda.id.au</p>