Only until now I realize that there is a dependency between the user information list and crawling the site. After a full crawl the user information list is updated with information in the User Profiles.
In a customer farm there are some accounts in the Imported User Profiles list where the display name is in the format domain\username. These names are also in the user information list (http://<portal>/_catalogs/users/simple.aspx). In the Imported User Profiles list you can edit these display names by editing the profiles. In the user information list this is not possible and I needed to change it because the people picker uses this list as source.
I searched the internet and found that a full crawl resolved this issue.
Tags: Profile import, User Profiles
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