I just updated to OS X v10.9 (Mavericks), and now whenever I start up any of my emulators, as soon as the emulator starts up, my entire computer freezes with a spinning
The hotfix (almost) solved it for me. After installing the hotfix my emulator was still not using HAXM. I had to uninstall the old version using the SDK manager. Once I did that I was able to get HAXM running. You can tell it is running by looking for the message in the startup window when you start a new emulator.