Webalizer Segfault after upgrading 8.0 to 8.1!

[Tormente]

We noticed that Webalizer had stopped dead in it's tracks the day we upgraded plesk,

running the command by hand, gives us these last few lines:

Webalizer V2.01-10 (Linux 2.6.5-1.358) English
Using logfile STDIN (ftp)
Using DNS cache file /usr/local/psa/var/lib/webalizer/webalizer.cache
Creating output in /home/httpd/vhosts/sub.domain.net/statistics/ftpstat
Hostname for reports is 'sub.domain.net'
History file not found...
Previous run data not found...
No valid records found!
Segmentation fault

Help! What is causing this? How do we fix it? Clients are starting to scream.