Skyview, I kept trying and finally got some success. Not sure which solved, but....
When I was exporting my xml from WordPress, I had the Start/End dates reversed, totally could have been it.
However, after importing this new xml (with the dates as they should be), I still didn't see the blogs under "unlinked"; then I refreshed the browser and there they were!
I hope this helps you; it's so frustrating! 😄