20% of people using Healthcare.gov site are having problems with their accounts?

According to  HHS Sylvia Mathews Burwell, 500,000 logged on in one day, but 100,000 had to call customer service.

Via Washington Examiner

Health and Human Services Secretary Sylvia Mathews Burwell said 100,000 people applied for health insurance coverage Saturday, the first day of Obamacare’s year-two open enrollment.
Burwell said an additional 500,000 people already enrolled in the program “logged in effectively” despite criticism that many existing users were unable to access their accounts on healthcare.gov.
“Some people forget their usernames,” Burwell said, responding to criticism on NBC’s “Meet the Press.” “Some people are renewing their passwords and other things. If there are any other technical problems, our customer service folks are ready and able to help people.”
Burwell told host Chuck Todd that customer service representatives took more than 100,000 calls Saturday from people seeking help signing up for insurance. [...]