"Malwarebytes XPC Service quit unexpectedly" warning May 03, 2018, 03:23:01 PM Usually as soon as I fire up Malwarebytes it updates the signature file, but today showed me the "Malwarebytes XPC Service quit unexpectedly" warning and the app hangs. OS X 10.8.5. First time it has done that. I deleted preferences, even re-installed but to no avail. I'm wondering if it's a problem at Malwarebytes or something insidious inside my computer at work. Any ideas?