This may be mostly an issue on Google Chrome.
There is an errant "pixel" of white just to the upper right of the wordmark in the Folwell header. This is actually part of the underlining of the linked text that is not indented far enough to fully hide it. The text indent should be increased a couple extra % to fully push it out into the overflow area.
Here's the css:
#mandatory-header-wrapper #umnhf-h-wm {
display: block;
float: left;
overflow: hidden;
height: 38px;
margin: 13px 10px;
white-space: nowrap;
text-indent: 100%; <-- increase this number just a touch to fix this
background-size: 288px 67px;
}
Andy

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