I have been having serious issues with VoiceAttack since I uninstalled Ivona 2 "Amy" once the trial period expired. After emailing back and forth with Gary, I decided to do a system restore to the point before it was uninstalled and low and behold, VoiceAttack worked fine again.
The problems included: crashing, failure to execute commands, a delay on executing commands, and inability to edit my profile.
So just a heads-up if you use Ivona 2 you may not want to uninstall it.
In retrospect, I remember reading it is near impossible to completely uninstall Ivona 2 because the uninstaller doesn't properly do it, and it leaves behind some files. I'm betting it was something left behind that was causing it.