Evolution doesn't show subject in list view
my evolution doesn't show the subjects of a special e-mail folder any more. There is a white rectangle as you can see in the attachmend. Unfortunately, I cannot say when this behavoir started. Either after an evolution update or after receiving a special mail. I sync also my mails with unison to another computer. Perhaps there went something wrong.
There are also no messages on the console, when I start evolution from a terminal.
Any ideas how to solve this problem?
Thank you in advance!