I can confirm this bug.
In fact nothing freezes and hitting "Enter" can make things come back to normal
(except you cant go back to your session, I suppose you can log in as a
different user..).
In fact the window that appear doesnt have anything written on it (but moving
the mouse we can see sort of a field).
** Changed in: gdm (Ubuntu)
Status: Unconfirmed => Confirmed
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switching to current logged in user freezes gdm
https://launchpad.net/bugs/78470
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