You can see that the layer is set to normal mode, opacity 100%. And the object fill is at 255 alpha on a light magenta-ish color--it should be that opaque color from what I can see. But it's masking color through to the background green from a lower layer; hiding the green layer makes it mask to the color of an even lower layer.
Ubuntu 13.10, Inkscape 0.48.4 r9939
The forum is cropping the image, if you left-click it and view the image in another tab you can see the layer and object fill/stroke dialogs to the right:
