[NTG-context] \rotate broken

Hi, The latest beta seems to have broken the \rotate command. \starttext \rotate{Test} \stoptext gives the following error ! Missing { inserted. system > tex > error on line 2 in file test.tex: Missing { inserted ... 1 \starttext 2 >> \rotate{Test} 3 \stoptext 4 <to be read again> \hbox \grph_rotate_finish_indeed ->\hbox \bgroup \ifx \p_rotation_rotation \empty ... \syst_boxes_with_next_box ...rotate_finish_indeed \egroup \egroup l.2 \rotate{Test} Vianney