On first run it complained that I didn't have permission to <do something>, then quit with "could not initialize data store". A reboot fixed it (and hence the reason I don't have the exact error message).

I'll give it a whirl. It seems like Mavericks is all too frequently popping something in my face and my magpie tendency is to go see what it is. (Yes, I know how to turn it off in stock Mavericks; I don't like how that works, either.)