I have also 3-4 freezes without any reason (1 or 2 when I setup some things in prefs). Only hard reset help to boot again. Also when I stop screen blanker with ESC button, Ambient pop up trashed with last blanker screen. Only I can do is to grab one window and erase that garbage with him. (Like on Win/XP sometimes, moving around screen )

Other than that, Mos working pretty good, looking very nice and I like it.