Dear all, I didn&#39;t use ConTeXt for some time and, so, have just re-installed the minimals tonight. When running on some of my files, Mark II does its job well but Mark IV tells me <br><br>error: Invalid field id nucleus for node type choice (0)<br>
.<br>l.133 ... M décrit l&#39;axe $({\rm O};\vect{e_{x}})$<br>                                                   avec une vitesse $\dot{x}...<br><br>I have absolutely no idea what it is trying to say to me...<br>If related, the macro is defined by<br>
\def\vect#1{%<br>  \overrightarrow{#1}<br>}<br><br clear="all">Regards,<br>-- <br>Flavien.<br>----------------------------<br>&quot;Quantum objects are completely crazy but, at least, they are all crazy in the same way.&quot; R.P. Feynman.<br>