Hello Martin IDS,
I am not able to reproduce the described error. Could you provide me with the web.config file of your SP2010 site and the configuration files of RadEditor for SP2010, which are located in the Program Files\Common Files\Microsoft Shared\Web Server Extensions\wpresources\RadEditorSharePoint\6.x.x.x__1f131a624888eeed\Resources folder? These are ConfigFile.xml, ListConfigFile.xml, ListToolsFile.xml, ToolsFile.xml, SPEditorTools.js.
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