Here is what to do.
1. Make sure that you are logged as an Administrator user.
2. Disable all the RadEditor features.
3. Perform iisreset.
4. Enable all the RadEditor freatures.
5. Perform iisreset.
6. Make sure that you have RadEditorList.ascx in the Program Files\Common Files\Microsoft Shared\web server extensions\12\TEMPLATE\CONTROLTEMPLATES folder.
The first time you activate a RadEditor feature, you must be logged as an Administrator user. This is required, because the editor needs to update the default list editing template by copying a file - from \TEMPLATE\FEATURES\RadEditorFeature\RadEditorList.ascx to \TEMPLATE\CONTROLTEMPLATES\RadEditorList.ascx.
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