I’m confused by the way Fontlab handles kerning classes in the OT kern feature. After I generate kern and select the kern feature in the OT menu no list of class definitions appears in the lower box. If I use “Import Fontlab Classes” the class definitions appear in the box, but when I compile the OT code I get this warning: “[WARNING] Glyph class @NSGothic1L-Ultra redefined [/Users/jpad/Documents/design/fonts/FontLab_settings/Studio 5/Features/fontlab.fea 26]”
I have not unchecked “Add all glyph classes to Opentype feature definition code”. What’s going on here?