[NTG-context] Letter module: signature with externalfigure fails

Hello List, I tried to include a signature (tried pdf, svg, png, shipped pictures) in my letter and it always fails. Example taken from correspondence.pdf Version 2010.08.27: \usemodule[letter] \setupletter[signature={\externalfigure[cow][height=2\lineheight]}] \starttext \startletter Thus, I came to the conclusion ... \stopletter \stoptext Results in: system > tex > error on line 6 in file bla.mkiv: Undefined control sequence ... [...] ! ==> Fatal error occurred, no output PDF file produced! mtx-context | fatal error: return code: 1 Latest ConTeXt version, updated today because of the other "version too old bug" in the letter module. Kind regards Christian