Apple TV not loading on Q box

[RMF1]

Apple TV will not start. I have updated the Q box software, cold booted and tried starting an Apple TV programme from the Sky Home menu as recommended elsewhere, but nothing works. The screen just sticks on the black launch screen with the Apple TV logo. 

Apply TV is working fine on my iPhone, and other Apps are also loading fine on the Q box. 

[lettice]

Try refreshing your apps;

1. Press Home on your Sky Q remote, then highlight Settings
2. Press 0,0,1 and Select to access the Installer menu
3. Select Apps then highlight Refresh all Apps on this box. You'll see a message that says, 'Your apps are being refreshed'.
4. Press Dismiss to return to normal viewing.

The refresh can take 24 hours to complete.