webalizer reports stopped

Hi everybody,
On a debian 8 / ISPConfig Version: 3.0.5.4p8 webalizer reports suddenly stopped. In the apache logs I see that access.log links to current date stopped on jan 2016 (probably after some upgrade):

ll /var/www/clients/client1/web13/log/
total 432K
lrwxrwxrwx 1 root root 19 janv. 13 2016 access.log -> 20160113-access.log
-rw-r--r-- 1 root root 13K févr. 10 18:18 error.log
-rw-r--r-- 1 root root 378K févr. 3 00:30 error.log.1.gz
-rw-r--r-- 1 root root 33K janv. 14 2016 webalizer.conf​

Where does ispconfig updates the access.log links to current ?
Any help greatly appreciated

 

Anybody there ?

I found /usr/local/ispconfig/server/cron_daily.php looks for a daily renamed access.log file but that file is not genrated.
logrotate rotates files in /var/log/apache2/*.log but where hell is the rotation of vhosts access.log files ?