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Date: Tue, 3 Feb 2015 22:52:00 -0500
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From: DJ Delorie <dj AT delorie DOT com>
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	Wed, 04 Feb 2015 04:45:22 +0100)
Subject: Re: [geda-user] Print layout hangs - followup
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> Width and height at exactly 0 probably results in some kind of numerical 
> exception. Think division by zero...

Yup!  That was it.

  pcb_fprintf (global.f, "%ma %ma %mi %mi %mi %mi %g a\n",
               sa, ea, -width, height, cx, cy,
               (double) (global.linewidth + 2 * global.bloat) / (double) width);

0 90 0.00000 0.00000 1.11000 0.30000 inf a

Note the "inf" as a result.

FYI zero "width" arcs are better drawn as zero-length lines, i.e. if
you want a filled circle (dot).