\usepackage{pgf-umlsd} % Connection diagrams
\usepackage{graphicx} % Graphics
\usepackage{epstopdf} % Eps graphics
-\usepackage{todonotes} % Todo notes
\usepackage{etoolbox} % Todo notes
-%\patchcmd{\chapter}{plain}{headings}{}{}
\patchcmd{\chapter}{plain}{headings}{}{}
\usetikzlibrary{arrows,shadows}