Index: admin/system_presets/simple/inp_ckconfig.js
===================================================================
--- admin/system_presets/simple/inp_ckconfig.js
+++ admin/system_presets/simple/inp_ckconfig.js
@@ -129,3 +129,4 @@
 
 // add ability to browse for documents
 //CKEDITOR.config.documentsBrowser = true ;
+CKEDITOR.config.allowedContent = true;
Index: core/admin_templates/js/inp_ckconfig.js
===================================================================
--- core/admin_templates/js/inp_ckconfig.js
+++ core/admin_templates/js/inp_ckconfig.js
@@ -129,3 +129,4 @@
 
 // add ability to browse for documents
 //CKEDITOR.config.documentsBrowser = true ;
+CKEDITOR.config.allowedContent = true;