Johnny found your problem.
If you turn off Javascript in your browser and visit your new page example, you'll see the sidebar appear.
Look at the code he highlighted, you'll notice there is a
<noscript /> tag which is causing your troubles. Remove that and all your sidebar text appears.
Your older pages use <noscript> and </noscript> tags instead of the <noscript /> tag you have on the new pages.
You need to lose (or change) that <noscript /> tag to make your sidebar appear on your new pages.