Observed that the windows title, it could not recognize the font and display correctly, even I overlay it with chinese font in ~/.fluxbox/overlay. But in gtk part of space, observe the tab, it do works to display properly.
Any Chinese fluxbox user facing the same problem?
Probably not if you login as a zh locale, what if you login to en locale and need the windows title to display properly? In gnome, they do not have such problem, in fluxbox they have, who can fix it? which developer should I email to?