In order to help you further I will need some additional information.
1. Confirm, which version of RadEditor for MOSS you are using.
2. Provide me with the configuration files of the control. These are ConfigFile.xml, ListConfigFile.xml, ToolsFile.xml, ListToolsFile.xml, which are located in the /Program Files/Common Files/Microsoft Shared/web server extensions/wpresources/RadEditorSharePoint/5.x.x.0__1f131a624888eeed/Resources/
in the mentioned path is the version of RadEditor for MOSS.
the Telerik team