Version 4.5.3 of the framework introduced a "Design" mode for pages. In the design mode all you can see is your page and module containers, no content.

To determine if you are in the design mode expand your control panel.

Look for the Plus (+) sign next to the design icon.

If you see the Plus (+) sign you are in "Design" mode and no content will show. Click on the icon and the Plus (+) will turn to a Minus (-) and you will see your content.