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I have a family of fonts I'm building in FontLab. They are all using the same exact kerning data and kerning classes. For some reason, one of the fonts is giving me a "serious error" in Font Book that says there is a "System Validation" error, with no further details.
I've tried taking a .vfb file from one of the working fonts, copying over glyphs from the font that's giving me trouble, and generating again. Same error. I think I've pinpointed the problem to be something kerning/class related, as if I copy/paste glyphs that AREN'T in a class and generate the font, I don't get an error in Font Book. But once I copy glyphs that are in a kerning class, I start getting the error.
I'm pulling my hair out because I have no idea why this is happening. I've tried resetting the metrics and kerning, then adding the data from the SAME .afm file the other fonts use, no luck. Same thing with the kerning class files. Any idea what could be causing this?! If I can provide you with anything else that might help solve this, just let me know. I'm beyond desperate at this point...