Created attachment 108077 [details] Packed .docx When opening a certain .docx file, LibreOffice shows some unneeded strange gray rectangles in some places. MS Office does not show. Check this picture: http://i.imgbox.com/D1IEln8v.png (Left is MS and the right one is Libre.) The problematic .docx also included. (I had to pack it using 7-zip because it's file size was over 3MB.)
those are non braking spaces. See View > Field shadings