XOOPS Version: 2.4.4
Module Name/Version: na
PHP Version:5.2 +
MySQL Version: 5.1.45
Web Server Software (Apache/IIS/Other): Apache
Operating System: Vista
Theme you are using: default
Custom template: (Yes/No) No
PHP Debug Messages: na
MySQL Debug Messages: na
Smarty Debug Messages: na
Site URL: http://montereybayimages.com

A full description of the issue:
In the Xoops, admin, Preferences Main >> >> General Settings, I have repeatedly set "Username for anonymous users." as anonymous, but after I click GO! to update the database, the "Username for anonymous" reverts to the name webmaster.

I checked my groups settings and those appear normal

I searched the Forums, but this does not seem to have happenned to anyone else. Does anyone have any idea why this is occurring and how to fix it?

I think there is a misunderstanding of the preference.

AFAIK, the setting is used, when anonymous users can post comments, forum messages, etc on your site (heavily discouraged). In stead of displaying their name, which is not available, because they are not identified by logging in, the setting is used.

Administrators are logged in, so their known username webmaster is used.

Some remarks about your site:
There is a different theme on the home and the module pages (less nice).
When hoovering the menu in home the text colour needs a change as it disappears on the background.
There is an URL rewriting in AMS (click comments?).

My Spam software has been sending my notices to the spam box. I have it fixed now.

Thank you very much for all of your advice and I will try to correct the issues on my site.