Posts Default to No Sidebar

My site is http://appletechtalk.com.

When I first stated using the Simple Catch theme, all of the posts automatically posted with a right sidebar.

I’m not sure exactly when it happened but in one of the updates, the default setting is now No Sidebar. It is not a problem for new posts as I just set the format before posting the article. However, I just noticed that all of my old posts (several hundred) have all reverted to the No Sidebar setting.

Is there anything I can do to force the posts, especially the old posts, to default to the right sidebar setting so I don’t have to manually change all of the old posts?

Thank you.

The page I need help with: [log in to see the link]