Module WYSIWYG with the 4.4.7 Ckeditor library stopped working
I would "downgrade" to the 3.6.x vrsion of CKEditor (such as CKEditor version 3.6.6.1.7696), since the WYSIWYG module does not support the 4.x version yet ...). In this case, you may also want to experiment with the various 'cleanup and output' options within /admin/config/content/wysiwyg/profile/your_txt_fmt/edit (with 'your_txt_fmt' the text format you're using, eg 'filtered_html').

Another option is to switch to the CKeditor module (which is in core in D8 now ...), and no longer use the WYSIWYG module in combination with the CKEditor library.