I had the same issues as mentioned above with Express. On my PC it told me I had an error (I believe with connecting to the Montana) & Express kept telling me I had the latest update. Found the 2012.40 updates & installed manually & then had to do the Unlock process via Garmin web page. Got it to work on the PC & then transferred to the Montana.
But this was the 2nd time in doing map updates & 2 time it was a PAIN
Shall call Garmin tomorrow.