TitleINTERNAL: rich text editior is not editable on an extended web application
1. Check if the js file for WAListForm.js is loaded?
Under the following folder:
C:Program FilesCommon FilesMicrosoft SharedWeb Server ExtensionswpresourcesWA.ListForm188.8.131.52__2b4b09f1c57c8f0b
You should see a file called WAListForm.js. If you open it it contains js code. Also in the browser's developer mode check to see if this file is loaded and that you see the content.
2. Try to disable and then enable Quest web Parts feature.