Ugly artifacts in chordname staff

[CSÉCSYLászló]

Hi lilypond folks,

lilypond-2.14.2 has some serious bugs regarding to chords engraving. The
attached .ly [1] did not have those ugly artifacts when I rendered it to pdf
using lilypond-2.12.3 (see [2]); now lilypond-2.14.2 renders those ugliness
there (see [3]). How to get rid of them (to achieve the same result that I had
with 2.12.3)? I am invoking lilypond as "lilypond -dno-point-and-click
nagy_halat_adjunk.ly" with both the aforementioned versions, if that matters.
What am I doing wrong here? I couldn't find anything related to this among the
2.14 changes nor in the 2.14 documentation.

[1] http://csecsy.hu/0ed8c7ecf8e3b8a/nagy_halat_adjunk.ly (source)
[2] http://csecsy.hu/system/files/nagy_halat_adjunk.pdf (2.12.3 output)
[3] http://csecsy.hu/0ed8c7ecf8e3b8a/nagy_halat_adjunk.pdf (2.14.2 output)
--
CSÉCSY László
vezetõ fejlesztõ / lead developer
http://kybest.hu