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Garmin's software, IMO, has never been very good at letting you know what it's currently doing much less giving you anything on the display to let you have a clue as to whether it's locked up or just processing files. Patience usually pays off.
If you have any further problems with your maps, you might try the older Garmin Mapupdater......http://download.garmin.com/lmu/GarminMapUpdater.exe
there is a Mac version too.