[Cheadstina]

Check your settings for auto renaming. I do the exact same thing and works as should on latest alpha. When you scrape a show it will be given a unique ID.

Thanks, I think that's it. Never noticed the settings for DB update  

When I add new episodes to an existing show, they are not automatically renamed - I do have the settings for DB update enabled.
How do I ensure/check that a show has a unique ID? 
Is that in the .nfo file or the EMM DB?