Just had some work done on my computer, and when it came home, the color of the Assembly Room, [and Vertex Modeler, and Spline Modeler] has defaulted to a very dark gray, where before it was white. Makes the objects very hard to see. I recall having gone through this change about two years ago, but can't recall how to re-set this color. The manual, as usual, is quite opaque on the subject. Any suggestions?