Advanced Icon Rule not working

[Tanjamuse]

Hi.

Can anyone tell me why only the second one of these two rules works:

First:

program:
uc = user_categories();
str_in_list(uc,',','Easy Access.Authors','easy access authors.png','')

Second:

program:
uc = user_categories();
str_in_list(uc,',','Easy Access.Relationships','easy access relationships.png','')

I don't if it makes a difference but the first one is based on the standard author's column and the second on a custom column with names (ambersand separated text, shown in tag browser)