I have updated the color configuration and the colors are not being reflected.
jtrac.color.gray #ffffff Background color for labels (Default ist #CCCCCC)
jtrac.color.header #ffffff Background color for header (Default ist #E1ECFE)
jtrac.color.lightblue #f5f5f5 Background color (Default ist #E1ECFE)
jtrac.color.mediumblue #cbc8c8 Color for highlighting (Default ist #C3D9FF)
jtrac.color.darkblue #d8d5d5 Color for highlighting (Default ist #0000D9)
Make sure the browser is not caching the stylesheet (jtrac.css). You may have to restart the browser to do so.
If that's not the issue, I'd need a lot more information to investigate this, as it works fine in general.
Sorry, this was overlooked. Changes are being reflected.