I thought I knew all about the significance of cell shading but recently noticed that there are 4 varying shades not the 3 I expected in the Library Module. The primary selected image the lightest, any secondarily selected second lightest, unselected a darker grey but now I see an even darker grey that seems to occur when there is more than one version of an image. Is this correct or is there some other explanation? I could not find any reference to this in books or help files. ( I have NOT set any color labels.)
I have attached a screen shot to show what I mean.
