CSS expects the images to have paths relative to the CSS file itself and this assumption is also expected by our CSSHandler that combines the CSS and resolves the urls back to the root of the site.
If you want to store images in /static and use them in CSS then you should put your CSS file also in the /static folder
<file cssvpath="/static/style.css" imagebasevpath="/static/">none</file>
In order for our CSSHandler to correctly combine things and resolve the urls, you must also make sure when you set background images in CSS to use single quotes around them like this:
.myclass {background: url('images/myimage.png'); }
note that this example would have the images in a sub folder below the folder with the CSS file named images, if its in the same folder as the CSS it would be:
.myclass {background: url('myimage.png'); }
Hope that helps,
Joe