Since the latest software update, the screensaver set by ambient mode is broken. Only displays a single picture and cannot be changed by pressing "up" on the remote. Instead the message "unable to load content. Please try again later". 

There is also an error in the settings page if you navigate to Settings | System| Ambient Mode, you get the message "Unavailable. Error loading page".

All other aspects of the TV seem to be working as expected but just can't utilise the screen saver properly. Anyone else seeing this issue?