Edit: After half day, my wife’s Mac started having the same problem. I have then applied the solution that I found in the Apple
Migration Assistant updated for Snow Leopard to Lion Transfers
If you’re planning on upgrading to Mac OS X 10.7 Lion today, then you will have to do a software update on Mac Snow Leopard before the installation to be sure you’ve got Migration Assistant version 1.0 installed.
The update fixes an issue that prevents the migration of data from systems running Mac OS X 10.6.x Snow Leopard to systems running Mac OS X 10.7 Lion.
OSX Lion Isnt Here Yet But Apple Promised It Would Be Here Today
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