Well, yes if I change the icon text colour it is now grey on white (or whatever) so it's readable.
And I can understand the box being shown when I am navigating round the desktop by keyboard not mouse.
BUT why doesn't it go when I move the focus to somewhere else? Try it on your PC (I tried XP and Gnome) and (1) the box is blue not white, so the text can be seen and (2) when you move the focus elsewhere the box goes.
I can see how to change the colour of the background, and the colour of the text but how do I change the colour of the box?
Thanks