I've heard mixed responses about this working/not working . Mine happens to not work since I've upgraded.
I upgraded rails by using a rails plugin that install rails 3.2.
http://github.com/galetahub/rails-ckeditor
For non-rails users, this basically just installs the latest version of CKeditor with an external yaml file for handling file management. But at a heart, CKeditor is unblemished.
But I made sure my disk was completely clean of any old CKeditor before reinstalling.
Also, I have in their own isolated environments tried pasting into their _samples they offer this :
        <script type="text/javascript">
        //<![CDATA[
            CKEDITOR.replace( 'editor1',
                {
                    fullPage : true
                });
            CKEDITOR.config.forcePasteAsPlainText = true ;
        //]]>
        </script>
This would have worked fine in their previous additions.
Has anyone else had this problem, and had it solved?
This is in regards to the config.js:
config.forcePasteAsPlainText = true;
Update
I tried completely uninstalling this several times and putting it back together. Without touching anything just adding forcePasteAsPlainText = true; into the config and it still doesn't work.