[NTG-context] Bib/bibtex duplicate entries

Hi! I am new to ConTeXt and juste created my first document, however there seems to be a strange behaviour in the output. Indeed I see a lot of duplicated bibliography entries. Moreover using sort=author did not sort the list. My document layout is as follows: usemodule[bib] \setupbibtex[database=thesis,sort=author] \starttext \startbodymatter \chapter{} \section{} \subsection{} \subsubsubject{} ... \stopbodymatter \startappendices \chapter{Bibliography} \placepublications[criterium=all] \stopappendices \stoptext I am using texlive-2009, LuaTeX beta-0.43.0-2009081914. Thanks a lot!