Switch from pizzicato to normal doesn't work using the Italian version

Strange problem reported by an Italian user (see also the original post ).
Steps to reproduce bug:

1. using the Italian version I created a new score from scratch
2. I added "violins 1" as instrument (I used the original "instruments.xml" file)
3. I added some notes
4. in the 2nf and 5th measure I added the staff text "pizzicato" and "normal" and I changed the text properties as described in the user manual

Expected behavior: switch from normal to pizzicato and from pizzicato to normal
Actual behavior: switch from normal to pizzicato works fine but switch from pizzicato to normal doesn't work (see the attached file Pizzicato-it.mscz).
If I change the MuseScore language from "Italiano" to "English US" there are no problems (see the attached file Pizzicato-en.mscz).
Similar problem with the “mute” trumpet.
I reproduced this problem using MuseScore 0.9.3, soudfont FluidR3_GM.sf2, OS Ubuntu 10.010 Maverick Meerkat and Windows xp SP3.
Thanks for your attention.
Antonio