OS X Mavericks is out, it’s free, and it’s awesome. If you use multiple displays then there is no reason you shouldn’t go upgrade right now because the way they handle multi monitors is now awesome. This was the main reason I wanted to upgrade so I decided to take the leap. If you’re thinking about upgrading to OS X Mavericks but aren’t sure what the risks are and what is going to break, I have relatively good news. Not a whole lot changes and mostly everything still works. All of my installed applications still work. Most command line stuff still works: compass works, ruby works, npm still works. I wasn’t expecting this easy of an upgrade, but even so there are some things that don’t work. Here are the things that broke and here’s how to fix them.