I use TeXShop "out of the box". In the Preferences I change a few font sizes, but for sure I do not touch the Engine tab. When I typeset, I get the message: /usr/texbin/pdflatex: unrecognized option `--shell-escape--synctex=1' This is pdfTeXk, Version 3.1415926-1.40.9 (Web2C 7.5.7) What is this? GG