Just guessing but did you kill the existing instances of navit or reboot? This is probably the same issue i described somewhere back in the thread that is encountered when closing the app with the maemo close button when not using the QT interface: it leaves components still running. Type "top" in terminal and see if you see something about navit in the list of processes. If it's there you can kill it with "killall navit". To properly shut down navit using the other GUIs, you have to use the exit button within the UI rather than the maemo "x".