Hi Alan I just found a problem around src/x11/Font_xlfd:538last week Below is my solution void fltk::setfont(Font* font, float psize) { FontSize* f = current; IFont* t = (IFont*)font; // only integers supported right now (this can be improved): psize = int(psize+.5); unsigned size = unsigned(psize); // See if the current font is correct: if(f && f->encoding && encoding_) { <<-- Suggest to add some check if (font == current_font_ && psize == current_size_ && <<-- May crash here (f->encoding==encoding_ || (!encoding_ || !strcmp(f->encoding, encoding_)))) return; } current_font_ = font; current_size_ = psize; Steve ______________________________________________________________________________________________________ ¥I¶O€~®e¶qµL€W­­¡HYahoo!©_Œ¯¹q€l«Hœc2.0§K¶Oµ¹§A¡A«H¥ó¥Ã»·€£¥²§R¡I http://tw.mg0.mail.yahoo.com/dc/landing