Comment 1 for bug 595432

reproduced with Inkscape 0.47+devel r9506 on OS X 10.5.8 [1]

Arial fonts (TTF) listed in Inkscape:
- Arial
- Arial Black (falls back to Arial, bolded)
- Arial Narrow (works)
- Arial Rounded MT Bold (works)
- Arial Unicode (works)

similar issues with other font families, e.g.
Delicious (OTF):
- Delicious
- Delicious Heavy (falls back to Delicious, bolded)
- Delicious SmallCaps (falls back to Delicious)
Fontin:
- Fontin (TTF)
- Fontin Sans (OTF) (works)
- Fontin SmallCaps (TTF) (falls back to Fontin)

Note:
1) all font variants can be selected and applied without issues in the Text&Font dialog.
2) in my tests I did not highlight any text, but just positioned the text cursor inside the current text object

[1] Arial: system fonts (Monotype)
    Delicious: <http://www.josbuivenga.demon.nl/delicious.html>
    Fontin: <http://www.josbuivenga.demon.nl/fontin.html>