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More bad news for homeowners. A survey out today by the group Core Logic finds housing prices down almost 4 percent over the past 12 months. Core Logic predicts prices will remain flat through next year. Meanwhile, debate over why the housing market bubbled up and crashed continues. Explanations include: lax lending policies by Freddie Mac and Fannie Mae, private mortgage companies too eager to write loans and greedy homeowners wanted more than they could afford. KPCC's Steve Proffitt reports.