courier imap fails to create a cache file

[Benedict Verheyen <benedict.verheyen@gmail.com>]

Hin

i installed courier imap 4.1.1 in an uml server as replacement for my 
current vserver setup.
It also has exim 4.63, maildrop, getmail4, spamassassin and clamav.

Courier is giving me following errors:
Aug 14 13:06:44 loki imapd: Error: Permission denied
Aug 14 13:06:44 loki imapd: Failed to create cache file: maildir_lock 
(benedict)
Aug 14 13:06:44 loki imapd: Error: Permission denied
Aug 14 13:06:44 loki imapd: Failed to create cache file: 
./.other/tmp/1187089588.M243537P2466_imapuid_5.loki (benedict)

The home directory is mounted from the host via hostfs.
In a vserver, it runs ok so the permissions on the home directory should 
be ok.

Maildrop is used to deliver mail and it also does something wrong: mail 
in my directory is delivered als root:root.

Any ideas on those errors?

Thanks,
Benedict