YouTube™ content is playing in thumbnail instead of full screen.

This is an issue with the YouTube app and is occurring on all Android™ devices.

Until Youtube fixes the issue, please follow these steps as a temporary solution:

1. Go to YouTube, and select Settings.
2. Select Preview with sound, and turn it Off.
   
3. Exit the YouTube app.
4. Unplug the AC power cord, then plug it back in.

If you want to keep Preview with sound feature set to On, perform either of the following steps as a temporary workaround:

Note: These are temporary workarounds, so you may face the same symptom again even though these steps are performed.

• On the YouTube page, navigate to another music content/title, wait until the preview start, then press the ENTER button on your remote control to play the content in full screen.
• On your remote control, press the HOME button, and select Settings → Apps → YouTube → Force stop → OK, then relaunch the YouTube app and play the content.
• Unplug the AC power cord (mains lead), then plug it back in. After that, launch the YouTube app and play the content.