FreeTimeSearch and Scheduler info

I am creating a meeting in a mailfile. The owner of the mailfile is not a user in the Domino Directory, but the name of a mail-in database (which points the a notes database, created from the mail-template), according to the document “Integrating C&S into a group application”.I am using the method NotesSession.FreeTimeSearch to search for the first available time for the user and a Room.

It works fine but one issue: When I re-open the meeting-document in the calendar, the info in the scheduler-section is gray. I need to refresh (the refresh-button or F9) to display the correct information.

What am I missing?