What version of Data Bridge are you using?
The Latest version of Data Bridge uses an newer version of the CKEditor.
make sure you have Data Bridge 1.1.3 installed, then delete the webassist/ckeditor and webassist/kfm folder. edit the HTML Editor instance and click OK, to have those folders recreated using the newer version.
in the webassist/kfm/idex.php file, use IE9 mode instead of IE8:
<meta http-equiv="x-ua-compatible" content="IE=9">