Sidebar appearing on Posts but not on Pages

Hi – I have three two versions of this theme which I am trying to merge into one.

The first is here: http://mindspyder.com/thinkred/ – as you can see there is no sidebar, however if you go to http://mindspyder.com/thinkred/this-is-a-post/ you can see the sidebar is working.

The second is here: http://mindspyder.com/red3/ – as you can see the sidebar is working fine here. I have compared all of the settings I can think of in the backend on both sites and they are identical.

I have also tried to get the sidebar to appear on this site: http://mindspyder.com/red2/ without any success.

Please advise!