Beta is very unstable for me. Nothing is working, which was true in earlier versions as well. Blank icons; Prefs pane doesn't open on first click; Unable to do anything but relaunch the Dock and add duplicate or blank docks. Settings are not saved. Yes, I have logged off and back in, yes I have repaired permissions. This would be very useful but it is worthless as it is today. I can't evaluate what doesn't even begin to work. ALSO: VT link to Download Previous Versions is the same as Download Now link.