channel 4 replied email !! they suggested: reset the smart hub after update the app and the firmware of the TV. and it works! To reset the smart hub, please follow these steps: 1. Navigate to the smart hub home page. 2. Press D (blue) for settings. 3. Scroll to 'Reset' and press. 4. Go to Samsung Apps store. 5. Find 'All 4' and click 'Run now'. Hope it could work on your TV as well.
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