@quaec - do you still have the issue with current trunk?
'Aller', 'Aller Light' work as expected with Inkscape trunk r13673 and Inkscape 0.91pre2 r13633 (see attached screenshot with trunk r13673 on OS X 10.7.5, using glib2 2.42.0, gtk2 2.24.25, fontconfig 2.11.1, freetype 2.5.3, pango 1.36.8).
@quaec - do you still have the issue with current trunk?
'Aller', 'Aller Light' work as expected with Inkscape trunk r13673 and Inkscape 0.91pre2 r13633 (see attached screenshot with trunk r13673 on OS X 10.7.5, using glib2 2.42.0, gtk2 2.24.25, fontconfig 2.11.1, freetype 2.5.3, pango 1.36.8).