Hello, The problem is due to the babel package and the ":" appearing in the \label{} definitions. A similar bug is reported here in the LaTeX bugs database: http://www.latex-project.org/cgi-bin/ltxbugs2html?pr=latex/3869&introduction=yes&state=open
If your remove all the ":" in the \label and \ref commands in my previous example, there is no errors. Christophe -- Christophe Garion SUPAERO - Département Informatique [EMAIL PROTECTED] 10 avenue Edouard Belin Tél : (33)5 62 17 80 57 BP 54032 Fax : (33)5 62 17 83 45 31055 Toulouse Cedex 4