If you are getting a blank page when trying to get to Webalizer from within zPanel you can edit the module.zpm file as follows. Find the /etc/zpanel/panel/modules/webalizer_stats/module.zpm file and line 10
from :
<div class=”zmodule_desc” id=”zmodule_desc_<@ ModuleName @>”><@ Description @></div>
to :
<div class=”zmodule_desc” id=”zmodule_desc_<@ ModuleName @>”><@ ModuleDesc @></div>