Just remove your current version if the theme is breaking it and install this version. Use root explorer and move to your /system/app and change permissions to r,w,r,r.

Open metamorph and re theme your Google Voice

I've rolled back and reapplied the theme successfully

***as always, backup before you do anything and do at your own risk. I'm not responsible for your phone breaking if you try the above***

GoogleVoice.apk