Did you assign a keyboard key (combination) to the "When I press keys" option with the "Do not allow key to be passed through" option enabled?
That would, as the name suggests, prevent that key from being registered by applications other than VoiceAttack.
The "When I press keys" option is also intended to, again as the name suggests, execute the command when that key (combination) is pressed. It does not send keypresses to other applications.
If you want a command to send keypresses to an application, add the keypress action to the action list using the "Key Press" button on the left-hand side of the "Edit a Command"/"Add a Command" window, with the appropriate settings (E.G. the keys to be pressed, and the time you want them held down for; 50ms/0.05s can be a reasonable baseline for many applications).