Mark Dain
I'm going to reinstall over the weekend which will put me back on 10.10.0. I think I'll just stay on that version until I've figured out what I want to do. I'm considering switching to Linux, although I don't know how well it runs on MacBook Airs. I have a large number of requirements that make it somewhat non trivial. Ideally I'd just move back to Mavericks but I doubt that's possible.