As I said before:
<posX>100</posX>
<posY>280</posY>
<width>1166</width>
Coverflow covers whole screen from left to right... (with SVN 27445 from dev-ftp)
As you can see from your own screenshot, the patch is no way working as expected.Something in your build is not updated... try and delete mediaportal\Core\guilib\GUICoverFlow.cs and update from SVN again.