[Users] Claws marks all messages as unread when clicking on folder

[Teuchert, Peter]

Hi there.

This is my first message to users at lists.claws-mail.org. I hope, i am
doing all right :-)

I have this question:
I am using claws mail version 3.15.0 on a Win7-system. When i read all
my messages in inbox, all messages are marked as "read". That's fine.
When i close claws and open it again, all these messages are marked as
"read", too. But when clicking on the inbox-folder, claws changes the
mark of each message in the folder to "unread". The same with another
folder named "Archiv", where i put all older messages in. I can mark
all messages as "read" again, but when i restart claws, it is the same.

Is there any option i set in wrong way? Is it a bug? What can i do to
change this behavior?

Best Regards
  altesCoon