The camera appears to working fine at this time. Norwegian Cruise Line cameras update their images typically every minute, so there will be at least on refresh at the 30 second mark which will be the same. On the second refresh the image may not appear to change (depending on the position and movement of the ship) but you will notice Norwegian's time stamp at the top of all their images changes indicating that it is definitely a new image.
The camera may have been having issues when you first reported it but it is working correctly now.