If your talking about the toolbar... Might want to read this Toolbars aren't a good thing to have.
But if your talking about a visual defect, it might be your video card/monitor since that screenshot looks fine. Sort of like when my monitor broke and half of it was bright white. Couldn't take a screenshot because it doesn't copy what the actually monitor looks like.
Ghan has said he has fixed this. Monovertex please confirm this fix. This was only a problem with people that had signatures in the upper levels like not the special members but the respected members.