Here is the official statement from HHS about what to do if you're stuck: "If you’ve tried Healthcare.gov – especially in October or early November – and your application seems stuck or you can’t move forward, try starting the process again. First, log in to your account, select the application in progress and hit “remove.” Then close and re-open your web browser. Log back into your Healthcare.gov account and start a new application. Having trouble? Call our Customer Call Center at 1-800-318-2596." This is exactly what has been recommended in numerous comments here. There is a screenshot of where to find the 'remove' button here: http://www.hhs.gov/healthcare/facts/blog/2013/12/marketplace-what-you-need-to-know.html along with other suggestions.
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