I'm experiencing similar issues
[root@vps1077 root]# ls -alh /home/httpd/vhosts/example.com/statistics/logs/access* | sort -n +4
-rw-r--r-- 1 root root 25K Jun 8 12:03 /home/httpd/vhosts/example.com/statistics/logs/access_log
-rw-r--r-- 1 root root 239M Jun 8 11:53 /home/httpd/vhosts/example.com/statistics/logs/access_log.processed
[root@vps1077 root]#
Domain name changed to protect the innocent.
I've tried updating these stats manually,
[root@vps1077 root]# /usr/local/psa/admin/sbin/statistics --calculate-one --doma in-name=example.com
Webalizer V2.01-10 (Linux 2.6.9-022stab078.21-entnosplit) English
Using logfile STDIN (clf)
DNS Lookup (15): 9 addresses in 0.47 seconds
Webalizer V2.01-10 (Linux 2.6.9-022stab078.21-entnosplit) English
Using logfile STDIN (clf)
DNS Lookup (15): None to process
Webalizer V2.01-10 (Linux 2.6.9-022stab078.21-entnosplit) English
Using logfile STDIN (ftp)
DNS Lookup (15): None to process
Webalizer V2.01-10 (Linux 2.6.9-022stab078.21-entnosplit) English
Using logfile STDIN (ftp)
DNS Lookup (15): None to process
Webalizer V2.01-10 (Linux 2.6.9-022stab078.21-entnosplit) English
Using logfile STDIN (clf)
Using DNS cache file /usr/local/psa/var/webalizer.cache
Creating output in /home/httpd/vhosts/example.com/statistics/webstat
Hostname for reports is 'example.com'
History file not found...
Reading previous run data.. webalizer.current
Error: Unable to restore run data (1)
Webalizer V2.01-10 (Linux 2.6.9-022stab078.21-entnosplit) English
Using logfile STDIN (clf)
Using DNS cache file /usr/local/psa/var/webalizer.cache
Creating output in /home/httpd/vhosts/example.com/statistics/webstat-ss l
Hostname for reports is 'example.com'
History file not found...
Previous run data not found...
No valid records found!
Webalizer V2.01-10 (Linux 2.6.9-022stab078.21-entnosplit) English
Using logfile STDIN (ftp)
Using DNS cache file /usr/local/psa/var/webalizer.cache
Creating output in /home/httpd/vhosts/example.com/statistics/anon_ftpst at
Hostname for reports is 'example.com'
History file not found...
Previous run data not found...
No valid records found!
Webalizer V2.01-10 (Linux 2.6.9-022stab078.21-entnosplit) English
Using logfile STDIN (ftp)
Using DNS cache file /usr/local/psa/var/webalizer.cache
Creating output in /home/httpd/vhosts/example.com/statistics/ftpstat
Hostname for reports is 'example.com'
Reading history file... webalizer.hist
Reading previous run data.. webalizer.current
No valid records found!
[root@vps1077 root]#
Something else I find odd is the fact that the domain bandwidth usage is update to date until June but the webalizer stats have stopped since January