[NTG-context] Chinese text failed to flow around pictures

when I tried: \placefigure [right] {Some picture} {\externalfigure[temp][type=jpg,width=5cm]} Blah blah ... % These should be pure Chinese characters. In the generated Chinese PDF file, the paragraph right after the figure just runs over the picture like it were not there. But if I append some English words before Chinese, everything would be fine. And \startfiguretext[left] works as expected. Any ideas? Guo