Cannot delete folders from Maildir in only one account

[Christian Vielhauer]

Hi

I try to delete the folder „test" from Thunderbird 31.4.0 (Win), Webmail (Sogo 
2.2.16), or Mail 8.2 (Mac Yosemite), but I am not able to delete in this 
account.
Nevertheless I am able to create new folders. These new folders are not 
deleteable, too.

dovecot 2.2.9 on Ubuntu 14.04 LTS 64-bit


In /var/log/mail.{err,log} I cannot see any errors.


In another account it works without any problems. (create and delete folders)



Have you any hint, I can try?

Chris