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After some research I found that the problem happens when the widgets get small because of resizing.
When the height or length of an arc is just 1, then the following method performs a division by zero, what prints an infinite (#INF) to the ps file.
void Fl_PostScript_Graphics_Driver::arc(int x, int y, int w, int h, double a1, double a2) {
fprintf(output, "GS\n");
//fprintf(output, "BP\n");
begin_line();
fprintf(output, "%g %g TR\n", x + w/2.0 -0.5 , y + h/2.0 - 0.5);
fprintf(output, "%g %g SC\n", (w-1)/2.0 , (h-1)/2.0 );
arc(0,0,1,a2,a1);
// fprintf(output, "0 0 1 %g %g arc\n" , -a1 , -a2);
fprintf(output, "%g %g SC\n", 2.0/(w-1) , 2.0/(h-1) );
fprintf(output, "%g %g TR\n", -x - w/2.0 +0.5 , -y - h/2.0 +0.5);
end_line();
// fprintf(output, "%g setlinewidth\n", 2/sqrt(w*h));
// fprintf(output, "ELP\n");
// fprintf(output, 2.0/w , 2.0/w , " SC\n";
// fprintf(output, (-x - w/2.0) , (-y - h/2) , " TR\n";
fprintf(output, "GR\n");
}
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