More than possible computer woes lurk as HealthCare.gov's second open enrollment season begins this coming Saturday.
There's a bright look to the rebuilt website, so version 2.0 of President Barack Obama's health insurance overhaul represents another chance to win over a skeptical public.
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But the risks include an unproven system for those renewing coverage and a tax hit that could sting millions of people.
Those tax issues are the result of complications between the health care law and income taxes, and they will emerge during next year's filing season.
The Obama administration cannot afford a repeat of last year's online meltdown. Congress will be entirely in Republican hands, and GOP lawmakers will be itching to build the case for repeal.