When do these messages appear? (E.G. after the profile loads, each time you execute a command, periodically even when not executing commands, ...)
If you disable plugin support and create a new, empty profile, do they still appear?
They don't look like messages I have personally seen generated by VoiceAttack itself, so they may actually be generated by the third-party profile and/or plugin you are using.
VoiceAttack itself does not use the Documents directory by default, either.
Note that if VoiceAttack is not running as administrator, a log message with an orange icon should appear on startup, noting "VoiceAttack privileges not elevated. Pro Tip - If you are having trouble with key presses being recognized, try running as an administrator.", unless you have previously chosen "Stop showing this message" in the context menu for that log entry.