[NTG-context] including movies broken?

Dear All, it seems including movies does not work: \starttext \placefigure[here]{none}{\externalfigure[demo.mov][width=0.7\textwidth, height=.7\textwidth, label=demo]} \stoptext processed with "context test_mov.tex" results in ! LuaTeX error ...text/tex/texmf-context/tex/context/base/grph-inc.lua:810: bad argument #4 to 'format' (string expected, got nil) under latest Minimals (Mac OS X 10.6). Did end-user interface change or we are (as so often) are in the middle of some integral migration from "used to work somehow" to "it is done the right way finally" via "the best way to test is to release"? Sincerely, Michail