According to reports, losses in the first week of May alone erased all gains made so far this year for some managers. $10bn computer-driven fund BlueTrend dropped 7.57% during the first week of May. Rival AHL, the $20bn monolith run by the Man Group fell 3.3%. Uncertainty over the success of the European Union??s ?750bn bail-out plan has added to volatility, exacerbated by a so-called ??flash crash? in the US on May 6, 2010.