I think you were sitting near pc for so long, go wash your face, and don't go near pc for a while,I'd hate to ask this question, but are the Icons changing from black and white to color?
This is correct.If you mean the Icons displayed for each forum section, I think it is only coloured when there is a new thread/post you have not seen yet & Black/White are the sections that you have already been through & have not had anything new posted