Blotch in d

[GJO]

I downloaded 2.12.3 Lilypond today as I thought it may have been 2.11 version
causing this problem but I still get black marks in the letter d with the
version 2.12.3.

http://old.nabble.com/file/p27663079/Blotch%2Bin%2BD.jpeg 

Any ideas? It happens when the letter d or i is printed, in lyrics or markup
text.

Many thanks
Graham
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