I was running VMWare Fusion with a new Fedora 24 VM running but it locked up completely on me. Tried verifying disk, no issues found. Permissions, no issue found. Wouldn't reboot still, so I finally gave in and reinstalled OS X. I'm not quite concerned (yet) about the update, but, rather, what may have caused the lockup and mess in the first place. I have no software installed in the Fedora VM other than Fedora itself. Fusion is current. 16GB RAM, MacBook Pro 2012 with an I-7. Any ideas how a VM could have lunched this? My Fusion is a current version.