Not sure where to put this as it applies to all makes/models using the Vix image.
'From build 760 onwards the video-mode selection has been completely overhauled. It is no longer merely a plugin, but has been embedded as an integral part of the image.
It is now necessary to reflash your receiver, a online update will cause issues. Before flashing you can use the BackupManager to make a settings- and plugin backup. If done, you can flash in the usual way and during the First Install Wizard you can use the restore function to restore your backup. This way your box will be up & running in a couple of minutes.
Once the image is up and running, you should go to Menu> Setup> AV-settings, and make the settings in accordance with your setup.'