Location Manager's requestLocationUpdates called only once

I am calling the method and expect location updates multiple times:

locationManager.requestLocationUpdates("gps",0 ,0, loc_listener);

My loc_listener is defined as:

LocationListener loc_listener = new LocationListener() {
    private final String TAG = "xoxoxo.LocationListener";

    public void onLocationChanged(Location l) {
        Intent locationAlert = new Intent("xoxoxo.LOCATION_CHANGED")
                .putExtra("target_location", l);
        sendBroadcast(locationAlert);
        // locationManager.requestLocationUpdates("gps", 0 ,0, this);
    }

    public void onProviderEnabled(String p) {
        Log.i(TAG, "Provider enabled");
    }

    public void onProviderDisabled(String p) {
        Log.i(TAG, "Provider disabled");
    }

    public void onStatusChanged(String p, int status, Bundle extras) {
        Log.i(TAG, "Status changed");
    }
};

Defined as is, I will only get an update once, both on HTC Evo 2.2 and 2.2 + Google API emulator. The hack to get multiple updates is to uncomment the line which registers for updates on each update:

locationManager.requestLocationUpdates("gps", 0 ,0, this);

Have you guys seen anything like this?