Why was yaz (drospirenone and ethinyl estradiol) birth control recalled?

Complex: See: http://www.drugwatch.com/yaz/ "More than 10,000 women have filed lawsuits against Bayer and its affiliates for Yaz (drospirenone and ethinyl estradiol) side effects. Bayer reportedly has settled 8,250 cases for $1.7 billion, with more cases pending in federal and state courts nationwide." Bayer has faced a number of warnings from the FDA about this product but I can't find any information that suggests that there have been