Re: MANHATTAN WATER;  Insurer Says AIG Unit Must Cover Water Contamination Suit; 5th Circ. Hopes For 'Sanity' In Backing Legal Malpractice Arb.; Property Co. Says Insurer Must Pay $10M For Judgment; Captive Insurer Shareholders Can't Target Owner, Court Told; Insurers Must Cover Abuse Suits, NH Youth Centers Say