Comment 9 for bug 1333577

Sorry for the previous console message, they seem unrelated to the bug...

The issue can be reproduced easily by replacing the style attribute (empty by default) in the desktop group with:

  <group
     id="desktop"
     style="marker-start:none;marker-mid:none;marker-end:none;">

Note that you don't need to keep the 3 marker related attributes. The bug shows with just one of them.