I am new to the amsart document class. For some reasons \author (etc..) is not showing after I use \maketitle. This is my tex:
\documentclass[12pt,reqno,a4paper]{amsart}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{amsfonts}
\usepackage{mathrsfs}
\usepackage{amsthm}
\usepackage{latexsym}
\usepackage{pictexwd}
\usepackage{pdftricks}
\usepackage{natbib}
\usepackage{setspace}
\usepackage{color}
\usepackage[affil-it]{authblk}
\begin{document}
\title{Temptation, Asymmetric information and Committment}
\author{Mark}
\affil{University of Leicester}
\date{February 2014}
\maketitle
\begin{abstract}
To be written
\end{abstract}
\section{introduction}
...
\end{document}
and this is the output:

can anybody help me out?
amsarthave its own system for authors and their affils? – daleif Jan 24 '14 at 14:58