[maxenric]

You can try reloading the skin or restarting Kodi. That could display the missing artwork.

If that doesn't work, try updating the Next Aired addon database.
You do that by starting the addon. In the tv shows submenu, press the "Guide" button and wait for the window to open. Go to the top menubar and click the "Update" button.

Also, check your settings for artwork downloader. Do you store artwork locally or add them to the database?   

Tried all the steps mentioned. Nothing works. Artwork is stored locally.
The tv guide looks like this. Do you require logo.jpg to be of a specific size.

https://imgur.com/a/YJwSW    

Logos are required to be .png files - logo.png

Go to the addon settings:

• System > Add-ons > My Add-ons > All > TV Show - Next Aired
  
• Press "C" to open the context menu > Settings
  
• Make sure that "thumbnail type" is set to Logo
  

 

 I must be doing something wrong because I can't see "thumbnail type" at all.


https://imgur.com/GYwemv0