Trouble Changing TF3D Home Background

[discipler]

OK, here is the problem. I have already personalized the home page background image. But now I 'm wanting to change it to a darker image because the text on the homepage is white and difficult to read. So how do I change it again? No matter what I do, my personalized image won't go away. I even moved images out of the Documents>Pictures folder and the image remains! I went into Settings>Today> and unchecked the "use this picture as the background" option. I even browsed and selected a different photo. The name of the new image is recognized and appears under the check box. But when I close, the old image remains. I went back into the Today settings and selected the items tab. I deselected the TF3D item and closed out of Today. The original windows screen pops up with with the background being my new image, 50% transparent. When I go back in and reselect the TF3D, the old image is still present. Can any of you smart dudes or dudettes please help?