Ok, this one has me a little confused. One of my computers E mac G4 10.4.3 has this problem wherein any selected item has a black box around it. Moreover, sections of text will get this when the mouse is nearb too, even if the text is not selectable. Here is a screen shot to illustrate what I am talking about.
Interestingly it seems to only do this in the student account
Interestingly it seems to only do this in the student account