A $6 million legal malpractice case brought by a life insurance policy investor against Arent Fox and one of its partners is headed to trial after a federal judge mostly rejected efforts by both sides to clarify whether the firm had made an error.

Windsor Securities, which lent money to several trusts so they could take out life insurance policies for elderly people that would serve as collateral for the loans, said the firm and its partner, Julius Rousseau, gave bad advice that resulted in its efforts to collect under the policies being disputed. Windsor ended up switching lawyers and inking settlements, but said Arent Fox and its lawyer are to blame for its losses.