This is an issue we have seen in a limited number of installations. We worked with Telerik and they have suggested the following resolution.
1. Confirm that RadControls folder is located at the root of your installation.
2. Confirm that the correct read permissions are set for the folder and all of its contents.
If the above is true proceed to the next four steps:
3. Open <Checkbox Root>\RadControls\Editor\Dialogs\blank.html in a text editor.
4. Delete the contents of blank.html and replace it with <root></root>
5. Save your changes.
6. Reset IIS or Recycle your application pool.
Please let me know if you have any further issues.
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