Some of our users (not all) who are accessing the section widget via the admin, are having escape slashes added to any HTML they place into the editing window upon save. Firefox is showing the following error:
The stylesheet http://mysite.com/wp-admin/widgets.php was not loaded because its MIME type, text/html, is not text/css.
I've seen references to this issue in other forums, though not specific to the section widget. No one has reported similar issues with other widgets, and some users with Firefox in different location are not having the problem.