Help Center Issue

I can see the HelpCenter in admincp, but when I try to access /helpcenter from the frontend as a user I get an error 404.  I have gone through and checked to make sure all files are where they should be and the .htaccess file has been updated, and cache cleared.

Suggetions on what I should check?

Update:  We tried going to /modules/helpcenter.php and the page comes up but /helpcenter does not.  htaccess line is in the file and a valid rule.