It will be at least 30 days before officials at Vermont's largest hospital know how well the transition is going to the new health insurance system that is going to start making and paying claims on behalf of patients, an official at Fletcher Allen Health Care in Burlington said Monday. Shannon Lonergan, the director of registration at Fletcher Allen, said she anticipated some troubles in the transition, which begins Wednesday, especially from patients who have enrolled in the new health care system through the Vermont Health Connect system but have not yet received their insurance cards.