Glitch in Photos when cropping in edit mode (Macbook Pro)

Where is your Photos library located? If it's on an external HD how is that drive formatted and connected to your Mac?

Are these RAW or JPEG files? From what camera and model?

As a test launch Photos with the Option key held down and create a new, test library. Import some of the same photos you've had problems with in your current library and test to see if the same problem persists. Does it?

If it doesn't then your current library is the culprit. Try repairing the library according to the instructions in this Apple document: Repair Your Library.

WARNING: If you're using iCloud Photo Library with Photos, this action will cause Photos to upload all your pictures again (from Fix missing or incorrect thumbnails in Photos - Apple Support).

Boot into Safe Mode, Mac OS X: Starting up in Safe Mode, and try the library from there to see if the problem persists.

Download and run Etrecheck. Copy and paste the results into your reply. Etrecheck is a diagnostic tool that was developed by one of the most respected users here in the ASC and recommended by Apple Support to provide a snapshot of the system and help identify the more obvious culprits that can adversely affect a Mac's performance.

Phot cropped perfectly, displays perfectly. Thumbnail is completely corrupted. If it performs the same as when i've tried a new library countless times before, the image itself when displayed in full format will soon become corrupted.

Léonie, the images are in perfect order. Editing them in Lr, Ps, On1RAW, Exposure, Affinity Photo AND iPhoto and Aperture creates perfect images as you would expect. The problem comes AFTER importing into Photos and CROPPING. Now you might say just crop in Ps and import into Photos to use as your catalogue. I have tried that but the nature of the display changes from day to day and images that pixelated yesterday mutate day by day. You've never seen such a thing.....

Hi Léonie. Yes I downloaded and installed immediately. I deleted my existing library and created a new one. My first 3 edits were great, difficult to crop but great. 4th time unlucky in this case, back to the usual and this time not only as a result of cropping, same result when using spot healing tool. I also encountered the dreaded pixelisation again, which is there and then goes back to normal and then appears randomly again. My retailer says they are talking to Apple engineers, I hope they are. There has to be a solution. Apple Photos is not only a photo editor/library but is also needed for other operations on the Macs or in Sierra so it worries me beyond the mere use of photos that i may encounter further issues elsewhere in the system down the line. I already cannot use the search function in MS Outlook 365 which is something I've never encountered before. I worry I might have got a dud!

First image imported .DNG direct into Photos, edited, cropped, saved in Photos library as edited .DNG. Second image (same image) edited in Ps saved as .JPG, imported into Photos, CROPPED and then the fun begins!

Imported into Aperture as .DNG, edited and cropped - PERFECT!

Exported from Aperture as full size .JPG, imported into Photos, cropped -

Immediate disaster, random, not same as previous corrupt but similar.

Léonie, yes confirmed. In every case the image can revert to original, be exported and is 100% ok. Editing in Ps or any other will be as expected, no issues. Going back to what i mentioned earlier, original .DNG and .NEF images imported into Photos and edited and cropped ONLY in Photos, worked and displayed correctly at times but randomly change nature of display, see screenshots from last night of excessively pixelated originally imported and edited images -

The MacBook Pro has other issues too -

Moshi Hub plugged in with a Sandisk image reader attached, but no card inserted yet, showing

It is completely impossible.

Photos showing presence of external device when none was present and after several close/opens, force quits and restarts. This morning the external disk is not showing. The fans were not engaged and the machine was not warm (yet).

There are too many problems with this MacBook Pro. I have spent almost 90 hours on these issues now and am no closer to resolution or an answer that i was at the start.

Same problem here. Was thinking maybe 10.12.5 update would solve it. Not a chance. Even ran a stock image right off the Mac, and it hosed. There's a workaround involving rotating, closing, opening and rotating again. Pretty labor intensive and 100% effective. Also, the auto adjust for horizon lines doesn't work, and retouch shrinks the images and won't allow any corrections. Flummoxed, non-plussed, but far from alone.

This is a massive problem. I don't know how to resolve it. I am getting no help from my retailer. After spending 90 hours trying everything possible, i'm spinning in circles, i feel as though i've men on a 3 day/night drinking binge!

Hello nib56. Thanks for your input. Maybe we should set up a FACEBOOK page to talk about this issue. We are not getting anywhere anyway! I bought my MacBook Pro from Digicape in Cape Town. I have dealt with them many years and bought a lot of machines from them.

Pixelised. The moment I click edit, the pixelisation resolves. Is this what I paid $4600 for ?

I can confirm that I also have the same issue. I am running macOS Sierra 10.12.6 on MBP 15" Late 2013.

Interestingly, it always seems to be the second from the last photo of the stream that is corrupted.

I do hope Apple can release a fix.....😕