P: Program error when saving, lag when zooming, changes not reflecting in document window (macOS)

don't update this, please. It was already working good now we all must downgrade and spent 5 hours to learn this =( 

Please let me be clear. This bug is making PS unusable for many people. The fact you've known about it for many months, and not addressed it is extremely disappointing. 

Hi Jeff - saving did not work when I opened up the larger psd file I had been working on but did work when I opened a jpg file and saved down as a psd. BTW, I am on a Windows 10 OS. Will not attach folder since this did not fix the problem. Thanks.

@roger_inkart I'm having the same issue right now....switching to 16 bit mode works but then files are huge! 

Followed the directions to the letter. Still getting the error. Where do I send the folder?

For those having this problem, if you restore your preferences using this manual method does it work correctly:

https://helpx.adobe.com/photoshop/using/preferences.html#Manually

If that doesn't solve it, you can quit Photoshop and put the Settings folder back.

Assisted support says this has helped the customers they've helped. We'd like to get a copy of your settings folder if this does correct the problem.

It seems as more updates are pushed out, the worse the performance of the program gets. I hope the developers do a better job in the future. It's frustrating to lose an entire day of work because of this.

Yea same. can't merge certain layers.

Having the same problem on Windows myself. Was working ok yesterday. No changes to the PC over 40 GB free on the drive. Now, after I add a new layer the file won't save. Have unstalled and reinstalled PS, rebooted, deleted preferences.

Hi guys!

Do you have any solution for Windows too?