Missing Icons/Images in Norton 360 Dashboard

I don't know if "Dashboard" is the right word, but I mean the window that opens when you open Norton 360. All of the icons/images are missing from the window, and there is only text. In order to close the window you need to click in the upper right hand corner, like usual--even though there is nothing visibly there to click on. All sub-windows seem to have missing images as well. It makes navigation a bit difficult.

Has Norton 360 been corrupted somehow? A virus scan turns up nothing but the usual tracking cookies, but I wonder if something more is going on. Any advice you have to offer about how to restore the images would be great, as it would make Norton 360 much more pleasant to deal with. Thanks!