Hi, It seems that nobody can/want help me out ... This is a regression in code because it works on the 0.9.47 version with : vcredist installed + commctrl.dll overwrited (not really needed, just for tooltips) + japanese font. I know that WTLib is not a free software but i can provide any result you want in order to fix that bug. Just tell me what should i do ! Thanks, Aurélien.