Comment 4 for bug 887660

I switched to the Gnome desktop and tried again. This time, no problem. Switched back to Ubuntu (with Google calendar still synced with Ubuntu) and no problem. So I'm not sure whether (a) setting it up in Gnome first fixed it, (b) the problem was fixed via some surreptitious update, or (c) there was some other fluky behavior in the sequence of setup that made it happen. Regardless, for now, the annoying login prompts have disappeared.