CSS properties of body (#wrapper) not editable after editor.setComponents(html);

When I save my page in a database refresh, the html and css are set like so $.ajax({ url: "../feeder.php", type: 'POST', processData: false, contentType: false, data: fd, success: function(result){ var response = JSON.parse(result); html = response.html; css = response.css; //editor.CssComposer.getAll().reset(); editor.setComponents(html); editor.addComponents('<style>'+css+'</style>'); }}); But I cannot seem to be able to change the background image. It kind of gets stuck and the whole page then gets ruined. What am I missing? I can set a new image as background but background-color doesn't...