(NEW YORK TIMES) MIAMI — The glitches in the new electronic health care sign-up system began almost immediately at the Jessie Trice Community Health Center, in one of this city’s poorest neighborhoods, and they never let up.

With a potential applicant by her side, Linda J. Lott, a certified application counselor, stood at her computer terminal and typed the word “Florida” into the insurance exchange network Web site.

“The system is down at the moment,” it read.

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