It seems that it's up again.
Sorry for the late answer. I have cleared the browser-cache and also checked the editor. It says tinymce_3_5_11_b In the meantime I had to switch to Windows 10, and actually I can't reproduce it. I will post a new Issue with the HTML-Source if it happens agein.
Chrome looses style settings for text
PDF export: Includes werden nicht über den Seitenumbruch fortgeführt
PDF Export: Includes at the end of a page are not shown completly