http://www.gingliders.com/team/paragliding/blog/report-rest-day-world-cup-superfinal-mexico-valle-de-bravo-2011/

Housi made a great start by winning the first task, but in
following days we had a couple of serious incidents with the Boomerang X not
recovering as well as it had in our previous testing. Despite the fact that
pilots are racing with full bar in sometimes extremely turbulent air, these
incidents should not have happened.

Following investigation, we found some line shrinkage problems that have caused
the glider to go out of trim. This affects both the performance and recovery
characteristics.