Cyrus discrete murder issue : CREATE creates mail folder on frontend

Hi all,

I have created a murder cluster containing 1 update server, 1 frontend and 2 backends. 
Mail reading woks ok, also moving folders between backends. 
However when a client creates a new folder, it gets created on the frontend and not on a backend. 

I am using cyrus-imapd version 2.5.10 from debian testing

# My frontend Configuration
configdirectory: /var/lib/cyrus
proc_path: /run/cyrus/proc
mboxname_lockpath: /run/cyrus/lock
mupdate_config: standard
default server:imapbe2.***
server list:imapbe1.*** imapbe2.***
partition-default: /var/spool/cyrus/mail
altnamespace: yes
unixhierarchysep: no
lmtp_downcase_rcpt: yes
admins: cyrus root murder
proxyservers: cyrus murder
proxy_authname: murder
allowanonymouslogin: no
popminpoll: 1
umask: 077
sendmail: /usr/sbin/sendmail
sieveusehomedir: false
sievedir: /var/spool/sieve
hashimapspool: true
allowplaintext: no
sasl_mech_list: GSSAPI PLAIN
allowapop: no
sasl_minimum_layer: 1
auth_mech: krb5
unix_group_enable: 1
sasl_pwcheck_method: saslauthd
sasl_auto_transition: no
mupdate_server: update.***
mupdate_username: murder
mupdate_authname: murder


any help is heavily appreciated.

Tim
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