Customers cannot boot after install 10.11.1 update
Non of the magic fixes listed on forums so far have helped with booting 10.11.1 on a Samsung 850 EVO 500gb or 250gb 1TB Solid State Drives. Only taking it back to 10.11 or cloning onto a Hard Drive solved the boot issue. This was on iMacs and MacBooks a Mac Mini managed to boot but Applications quit and lagged, failed and became unusable.
I cant believe Apple engineers have not tried replicating this but it was always going to end up with a problem like this because Apple Developers short-sightedness and Apples need to push the latest “Bleeding Edge Update to OSX” and not allow clients to choose a safer previous update has created this trap.