After I wrote my last diary entry this morning, I went back to healthcare.gov and started another new application (#4 online - for those who are counting). I was extremely careful with the information and the format of my responses. I sailed right through to the end and enrolled!
Unfortunately, the amount of subsidy I had expected, based on a previous application that actually got that far, was much less and I will have to pay $130 more/month for the plan I wanted.
Any questions? I'll be happy to help. By the way, this was done on a Windows 7 operating system with Chrome as the browser.