Hi,
Yeah, it clearly looks like at the sharp angles on the outside of the N, the lines cross themselves when you set it to bold. I don't have such an empty font (and I can't find that specific font online), but I think this is not a generic issue, but a problem with this specific font design.
As you can see in the picture of the non-bold version, right before the corner where it goes wrong, it has a slight change of angle. When you set the font to bold, the edges will be offset, and because of this change of angle, it will intersect itself. This results in a degenerated polygon, so the surfaces fail to properly generate.
Please try it with a different font, or avoid using the bold option for this one. If you need this font and need the letters to be bolder, you can still convert them to morphs and change them manually.
I hope you will be able to work on with this information.
Regards,
Daniel Alexander Kovacs
Professional Services Consultant
GRAPHISOFT
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