[Shotwell] No event pictures

[Gerrit Draisma <gdraisma xs4all nl>]

Hallo,

I am missing about half of the pictures
in Shotwells event view. Half of the events
have just a grey square instead of one of the
pictures associated with the event.
The other events show one of the associated pictures.

Is there a way to update the event view
or the event picture?

Sincerely,
Gerrit