The breadcrumbs are being loaded in by something…are you using NavXT Breadcrumbs plugin? My concern is that black background that the current breadcrumbs are showing with the black background looks like something in the layout is broken which could be the issue for the widget you are referring to in this thread. A broken layout could be something very small such as a missing quote around code, a missing opening or closing tag…a number of things. It could be in the content part or the theme code. More likely it’s something with content or a plugin that you installed because if it was the theme code itself, then everyone would be experiencing this broken layout.
The frustrating part is the process of finding it because sometimes its very complicated to locate something when you do not know what or where it is…very time consuming process.
So what happens if you disable all your plugins that you installed?