Comment 7 for bug 522471

This is now fixed in Radiance (awaiting upload, etc).

For all other themes, you need to add a style which includes a bg[NORMAL] and match that to ido-offscreen-scale. Something like this will work:

style "soundfix"
{
bg[NORMAL] = "#ff000" # change this color as needed
}

widget "ido-offscreen-scale" style "soundfix"

NOTE: you can also just match it to the style which defines the menus, etc.