Scout uses Apache Batik to render SVG graphics. As with other formats, rendering results are implementation dependent. So if a file looks good in Internet Explorer it must not necessarily look the same in Batik and vice versa.
In your case, try to use proper URLs to point to your images, e.g. file:///C:/development/scout-workspace-juno/svg/test.jpg. This did the trick for me.
If you are unsure if the problem is located in Scout or in Batik, you can download a simple SVG viewer from the Batik website. Download the binary distribution and run batik.jar. You can then load your SVG image and check if it renders correctly.