It has been reported in the Zpanel Forum that the Webalizer module installed with Zpanel on Windows O/S with Apache hasn’t been functioning since ZPanel version 10.1.0

Here is the Zpanel forum thread that leads to the fix.

http://forums.zpanelcp.com/Thread-Windows-ZPanel-not-showing-web-statistics

Here is the thread that contains the file attachment to be downloaded:

http://forums.zpanelcp.com/Thread-Windows-ZPanel-not-showing-web-statistics

You will need to login or register and login to the forum to download the fix. OnDaemonHour.hook.php

Rename and replace the original OnDaemonHour.hook.php file in the following path:

C:\zpanel\panel\modules\webalizer_stats\hooks\

Thanks, bushr4anger

His quote:

You were on the right track, here’s the fix for windows ( was due to webalizer command string being incorrectly formatted )
Just replace OnDaemonHour.hook.php with the attached file

btw… I used the zGodx module to run zDaemon so I could see instant results

Here is the original download link for the PHP file:
http://forums.zpanelcp.com/attachment.php?aid=538

This is the same file in a zip archive:
http://www.sheldonsblog.com/?p=3169