User blog comment:DaNASCAT/Technical Update: November 4, 2014/@comment-5007040-20141107163246

When logging in the new wiki navigation bar (here on cc) will get a darkblue background in the middle of it. Guess it has to do something with the background middle option in the theme designer or just a bug. I tested it in three browsers. I've got this problem in Mozilla Firefox and Google Chrome, however it seems Internet Explorer doesn't have this bug :)