I would automatically log out flawlessly, now rarely does, plus several other less convenient changes. Is LastPass known to cause issues? It's a handy app but doesn't work nearly as well as it used to when I started to use it about a year ago. I have only a few tabs loaded and have only done a little browsing since restarting everything and page outs are still climbing steadily with nothing running other than EtreCheck and Firefox. Boot up even takes a long time, longer than any of my old macs did or this one used to take. I think I did everything that has been suggested in this thread, ,removed divX, Perian, AppTrap, deleted many apps that I don't use, updated apps that I haven't used since updating to Mavericks, run cocktail before uninstalling it too and finally did a permissions repair via Disk Utility.