Bugs in voice switching under OS X

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Activate the chromevox options dialog using Chromevox+o, o.
2. Pull down the voices popup.
3. Select a voice different to the default one or the non-english Google TTS 
ones.

What is the expected output? What do you see instead?
ChromeVox is supposed to switch voices and use the selected one. Instead, if 
the voice is of a language different to English, the screenreader starts using 
the system's default voice. ChromeVox doesn't read the Combobox items, either.

What version of the product are you using? On what operating system?
I am using the latest available version of CHromeVox under Mac OS X 10.9 
Maverix.

Please provide any additional information below.
Somehow my ChromeVox started with the Zarvox voice selected, which wasn't the 
default voice.

Original issue reported on code.google.com by guilevi2...@gmail.com on 29 Sep 2014 at 2:45