PROBLEM Upgraded to 3.3.8 CKEditor Won't Display HTML Editor

[Connie]

I upgraded from version 3.3.8 to 3.3.9 today
using the short way: overwriting /admin and index.php
clearing the browser cache
log in into GetSimple

and bam: the editor is not visible, cannot enter text.

I have no plugins with "own editors",  and the editor is defined like this in gsconfig.php:

"# WYSIWYG toolbars (advanced, basic or [custom config])
# define('GSEDITORTOOL', 'advanced');
define('GSEDITORTOOL',"['Source','-','Cut','Copy','Paste','PasteText','PasteFromWord','-','Undo','Redo','Find','Replace','-','SelectAll','RemoveFormat'],
'/',
['Bold','Italic','Underline','Strike','-','Subscript','Superscript','-','JustifyLeft','JustifyCenter','JustifyRight','JustifyFull'],
['TextColor','BGColor','-','Rule','PageBreak'],['NumberedList','BulletedList','-','Outdent','Indent'],
'/',
['Blockquote','-','Smiley'],['Link','Unlink','Anchor'],
['Image','Flash','video','fileicon','Table','HorizontalRule','SpecialChar'],
      '/',
['Styles','Format','Font','FontSize'],['ShowBlocks'],['Templates']
");

# WYSIWYG editor language (default en)
define('GSEDITORLANG', 'de');

# WYSIWYG Editor Options
# define('GSEDITOROPTIONS', 'advanced');
define('GSEDITOROPTIONS', "entities : false,forceSimpleAmpersand:true,customConfig : '../../../../theme/gs.js',skin: 'v2'");"