Calendar entries disappearing

[ocset]

Hi

I am a new Kolab user and have installed Kolab 3 on Centos 6.4 server. 
Everything seems to have work as expected except for Calendar entries.

I have created a new user with what seems to be the default settings and 
I am able to log into the Roundcude web interface and send emails and 
create contacts.

When I create a calendar entry, it seems to work fine but when I switch 
to emails and then back to the calendar, the entry I created earlier is 
gone. I have tried to do some debugging and can see the calendar entries 
on the file system under 
/var/spool/imap/domain/s/domainname/t/user/testuser/Calendar. The 
entries are 1.  2.  3. etc.

Someone on IRC suggested not having the correct user permissions? As 
mentioned before, I have used the "kolab-webadmin" interface to create a 
new user but have not seen anywhere to add or remove permissions to 
things like calendar or email.

Thanks in advance
O.