Problem with re stemUp open notehead

[wjm]

Greetings Carl,
You wrote:-
++++++++++++++++++++++++++++++++++++++++

I think I might have noticed this before, but in the example below, all 
the "re" noteheads that are stem up that should be open (half note, 
dotted half note) are filled. Whole notes are not affected.
====
\version "2.16.2"
notation = {    \aikenHeads \time 3/4
\key c \major
d2. d' d'' d'''
d'2 d'4
\stemUp \time 2/4
d2 d' d'' d'''
}

\score {
{       \notation
\transpose c d { \notation }
}
}
====
++++++++++++++++++++++++++++++++++++++++

It seems to be a display artefact... zooming in on the relevant notes 
shows open heads partially obscured by leger lines (which are slightly 
fatter than staff lines) or staff lines (less obviously)
I tested the following using Frescobaldi 2.0.10 on Ubuntu 13.04

I hope this is helpful?!:)
Regards
Bill