fret-diagram, big black line across 1:st fret (no capo specified)

[bluelegend]

Greetings fellow lilyponders.
I am using Lilypond 2.12.3 (still the standard in Ubuntu Lucid I guess).

Problem: When I try to add some standard fret-diagrams [practically verbatim
from the manual] there always appears a big ugly black line all across the
1:st fret.
Tried to search but couldn't find any relevant previous posts. Help much
appreciated.

Below is a close to minimal example + the output:

%Produces big black line across 1:st fret, although no capo specified
\version "2.12.3"
\paper{ ragged-right=##t }
   {
      c'1^\markup \fret-diagram-terse #"x;0;2;0;2;0;" 
      c'1^\markup \fret-diagram #"6-x;5-0;4-2;3-0;2-2;1-0;" 
      c'1^\markup \fret-diagram-terse #"0;3;2;0;1;0;" 
   }

http://old.nabble.com/file/p33544697/strange_fretdiagram_output.png 


Best regards bluelegend :]
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