Site Logo, Name and Slogan completely disappear

In IE6 and IE7, if the combined width of the Site Logo, Name and Slogan is too wide for the window, they disappear completely. As soon as you expand the width of the window to a point that all three entries will fit, they instantly reappear. The expected behavior would be for the text to be cut off as the window size becomes smaller, not to disappear completely.

This functions as expected in FF2.