We've updated a few of the fields, among them Genre, to multi value fields. This means that the field can now have more than one value and the program will count each value separately.
For example previously "Thriller, Horror" would be handled as one genre and "Thriller, Comedy" as another. If you have a large collection of movies, chances are that you ended up with a very large collection of genre-combinations. Now with the new multi value field you can combine individual genres without having to merge them.
You can still autofill the genres by starting to type - the program will guess at what genre you're looking for.