There is a known bug in the rewardStyle WordPress widget in which when the widget is updated, it will sometimes deactivate. This has nothing to do with <em>press themes or their compatibility with the rS WordPress widget!
If your Shop the Post plugin is only displaying rewardStyle shortcodes, we recommend going to Plugins and ensuring your rewardStyle widget is set to Activate. Typically, if you have recently updated your rS Widget plugin, this is the culprit! Re-activating the widget should solve the issue completely.
If your widget is activated and you are still only seeing shortcodes, email us at email@example.com, and we can assist you with troubleshooting further.