Return of Reckoning

Thank you for that advice, but unfortunately it doesn't work. I replaced "showing=false" with "showing=true", but the tracker still doesnt show in the game.
Here's the whole XML-File:

<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
<UiModuleSettings xmlVersion="1.0" enabled="true ...

The open RvR tracker doesn't show any more, is this a known bug?
What can I do to fix it, tried hiding/showing the window using the layout editor, with no success.