Hi Kerry,
How did you get the source code, using TortoiseHG or the source code download links from codeplex? People often report this when they get the zip generated by the codeplex site, not sure what causes it but best to use TortoiseHG.
The only other things to check is that your Web.config file on production is configured to use the correct versions of the editors and that the editor scripts exist on disk under /ClientScript and that they have at least read permissions for the user that is the identity on the app pool.
The HtmlSetting control uses CKeditor, so make sure that is configured correctly in Web.config and the files for it exist on disk and have the correct permissions. If you are using a different editor for the main editor that would explain the difference of why it may work elsewhere.
Possibly the web.config on production is not correct but your local dev copy is?
Hope that helps,
Joe