I have the tinymce -control as a WYSIWYG-Editior in my asp.net page.
When I have e.g. a Text in Bold, after the Postback it is shown as
\"
Change the init function and set encoding to an empty string.
This is default setting, and worked in my case. See documentation on this page http://www.tinymce.com/wiki.php/Configuration3x:encoding