After reading many of these post it's quite apparent that Apple's new Photo has a very serious issue, of which I have experienced two more not mentioned here.
(1) Not only does Photo say it's closing its library for way to long, but I've let my brand new 27" 5K iMac run for three days non-stop just to see if that message would ever go away and IT DID NOT.
(2) Force quite is a joke and does not work.
(3) So I tried to shut down my computer only for Photo to BLOCK shutdown with NO OVER RIDE option to force my computer to shut down anyway like I could with older Macs.
(4) If all this does not already take the cake aside from Apple's original iPhoto which is a superior product to the very disappointing Photo, Photo repeatedly crashes! Additionally Photo opens up the wrong photo to edit about half the time and when I delete a photo during Edit mode, it kicks my out of EDIT mode. But when I click on EDIT to resume, it kicks me all the way back to the very first image and does NOT even take me back into the EDIT mode. Now I have to search through hundreds of images to get back to the image I want to work on, and that's ONLY if Photo actually opens the correct image, otherwise Photo kicks my all the way back to the very first image once again!! This program is full of fatal bugs.
I could go on as there are other serious problems as well. Simply said, Apple Rolled out a new inferior photo program to replace Apple's original iPhoto which was a massive downgrade from the original iPhoto with tons of awesome features now removed. Sadly I bought Apple's mast advanced iMac just to use iPhoto only to learn that Apple has tossed their most advanced iPhoto processing software into the trash can!! Had I known this I would have NOT bought a new mac., Photo is only 1.0 which is the first version with no track record.
Had Apple pulled this same stunt with Logic Pro I would be looking at legal action to get my money back. Since Photo is Free, we get whatever bones Apple tosses our way, in this case a poorly thought out Photo program with lots of potential many years from now.
PS: I will now pull out the pig from my APPLE to FARCE shutdown. I SHOULD NOT HAVE TO TAKE SUCH DRASTIC ACTION!!