SO CLOSE! Blog only showing most recent post…

Please help me out if you can.

I have spend all of last week struggling with an upgrade to 2.8.6. However, upgrade to 2.9 has cured everything….almost.

When I go to my blog, only the most recent post shows up. But everything is still there. If I look in a catergory, or in an archived month, many posts show up. But on the home page of the blog, just the most recent.

Any ideas how to remedy this??