I just upgraded to 0.14 alpha and it never seems to complete, it always hangs on "Closing the device" and does not close itself off. The player is ejected though since I see "Ok to disconnect" on my 512MB U10.
Also, and I think it's because of this, 0.14 alpha is not updating the database on the device.
I downgraded to 0.13 and it works fine. I used 0.12 before with no problems.
This refers to the Windows version on Windows XP SP2. Player is an 512MB U10 with firmware 1.64UMS.