In order to help you further I will need some additional information.
1. Provide me with the web.config file of your MOSS site and the configuration files of RadEditor for MOSS. These are ConfigFile.xml, ListConfigFile.xml, ToolsFile.xml, ListToolsFile.xml, MOSSEditorTools.js, which are located in the /Program Files/Common Files/Microsoft Shared/web server extensions/wpresources/RadEditorSharePoint/5.x.x.0__1f131a624888eeed/Resources/
2. Also send me a couple of screen shots where I can actually see the problem. Just make sure that you include the whole browser and not just the editor in them.
the Telerik team