Plesk 12.x / Linux :: Awstats Not Building Static Pages

I have an issue with Plesk and Awstats not building the html pages for website statistics. Problem is server-wide i.e. it effects all domains.

I've tried to manually run the /usr/local/psa/admin/sbin/statistics with every possible options but all that happens is that awstats calculates new stats to the vhosts /var/www/vhosts/system/domain.tld/statistics/webstat/awstatsMMYYYY.domain.tld-http.txt file.

Nothing is put into the /var/www/vhosts/system/domain.tld/statistics/webstat/YYYY-MM folder which should contain the static html pages.

Example listings:

Code:
# ll /var/www/vhosts/system/<domain.tld>/statistics/webstat
total 80
drwxr-xr-x 4 root root 4096 Nov 5 10:58 ./
dr-xr-x--- 6 root psaserv 4096 Oct 23 12:36 ../
drwxr-xr-x 2 root root 4096 Oct 23 13:12 2014-10/

[Code] ....

I was able to create the static pages by running Awstats directly:

Code:
# /usr/share/awstats/tools/awstats_buildstaticpages.pl -awstatsprog=/usr/lib/cgi-bin/awstats.pl -configdir=/usr/local/psa/etc/awstats -config=<domain.tld>-http -dir=/var/www/vhosts/system/<domain.tld>/statistics/webstat/current

So things I have already checked:
- Awstat paths in /etc/psa/psa.conf are correct
- Domain configs are ok as awstat can create the stats data and awstats_buildstaticpages.pl can can create the pages just fine
- File permissions are ok

I just cannot figure what the problem is. /usr/local/psa/admin/sbin/statistics doesn't give any errors but on the other hand it doesn't have a debug option either which might be useful.

OS: Ubuntu 14.04.1 LTS
Plesk version: 12.0.18 Update #22