I'm attempting to change the color of the drop shadow that is created by using 'Filters->Shadows and Glows->Drop Shadow...' but I am unable to do so. I read the topic here on the question:
http://www.inkscapeforum.com/viewtopic.php?f=5&t=9603
However when I click the GTK Slider widget:

it simply moves the slider, not open the color dialog window. Is this a problem with Windows GTK? Is there an element in the XML of the SVG file that I can edit to force a different color? All help is appreciated!