Summary:

The 'View Original' link is missing from onscreen notifications.

Resolution:

The issue here is to do with a customisation in the translations screen.

1. Go into administration -> customisation -> Translations.
2. In the caption family field type “ActionText”.
3. In the caption code field type “CommNotify” and click find.
4. Select the CommNotify translation.

The following was missing from the US translation:

<DIV loadLink="#" class="notificationDetails" style="padding:7 7 7 15; display:none;">#comm_note# <br><br><label loadLink="" onclick="window.location=$(this).attr('loadLink');">View Original</label></DIV>

This is why the view original option is not showing on notifications as it has been removed from the notification translation.