Hello David Slot,
Unfortunately I was not able to reproduce the issue on our test server. For your convenance I attached a small movie with my test. Please inform me if I am doing anything wrong.
What I suggest you to do is check if you are not using resource files of the previously used versions. Make sure that there is noMOSSEditorTools.js file in your browser's cache. Also execute iisreset command.
If cleaning the cache and executing the iisreset command does not help, please provide me with a step by step scenario of how to reproduce the issue. In order to reproduce the issue I will need the following files.
1. ConfigFile.xml, TollsFile.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/ folder.
2. If you modified the page layout with SharePoint Designer, send me the code where you are replacing PublishingWebControls:RichHtmlField
3. You can send me a sample content as well.
the Telerik team