Originally Posted by falko
You can try to use the chgrp command with the GID instead of the group name, e.g.
chgrp 12345 /path/to/file
It doesn't help. I cannot to login with right or false GID. After few time it switch again to GID 10027. This strange GID behaviour is on one account only. On others accounts and webs are right GIDs but I cannot login to IMAP too