We can't know. You have not provided any system information or other technical details like specifics of the document, storage locations and whatnot.
*** Collection <__NSArrayM: 0x608002841aa0> was mutated while being enumerated.
i got the same after updating to Yosemite.
Normally when i start photoshop, it works, i can open file. Usually i do it by double clicking the empty photoshop pane.
I am not able to find the exact flow of steps to reproduce it, but it is occuring really often like after 2 or 3 files on which i work . suddenly i got this message and i have to restart photoshop.
Ok so i discovered it.
It always happen in combination of things:
1. i have some file opened in photoshop (some jpeg)
2. i open as a second file some PNG made in gimp.
3. any next try to do open command brings the message "Could not complete your request because of a program error."
4. when i close all files and try to do open command i get "*** Collection <__NSArrayM: 0x608002841aa0> was mutated while being enumerated."
it only happen when i open the gimp png after there is something in photoshop already opened. Means that when i open the gimp png first, and then anything else, everything is fine.
(i am using gimp just because of Color To Alpha feature)
Would be nice to have it in photoshop.
Its so essential feature for background removing.
And simple to programm (i know it i did it in AS2).
Please hurry with the fix.
We're documenting this MacOS 10.10 bug for Apple, but don't have any information from Apple yet about when it might be fixed.
Can you post the file from GIMP that gives the Program Error that gets Photoshop into the state you describe?
Hi, I am also having this problem with any png file!
It's really annoying.
Quick get-around: If you press 'command o' three times it will open and skip the error message.
Not ideal but it works.
Have your tried creating a new Admin user account and run Photoshop from the new user account to see if the problem goes away: http://blogs.adobe.com/crawlspace/2012/07/photoshop-basic-troubleshooting-steps-to-fix-mos t-issues.html#Permissions