P: PS 27.4 & 27.5 (beta) Changing channels in Curves crashes PS with error: Could not update smart object files because of a program error (f376f9.749).

Bug Report: Program Error (f376f9.749) in Curves Adjustment Layer

Environment:

• OS: Windows 11 (latest build)

• Photoshop Version: 2026 (current release)

• Hardware: NVIDIA RTX 4000 Ada Generation, 128GB RAM (72GB allocated to PS)

• Document: 16-bit ProPhoto RGB, Fine Art photography

Steps to Reproduce:

1. Create a Curves Adjustment Layer on a standard raster layer.

2. Input several manual points in the RGB channel (e.g., Input 28 -> Output 24, Input 224 -> Output 229).

3. Immediately switch to the Blue channel via the dropdown menu in the Properties panel.

4. Result: Photoshop returns "Could not update smart object files because of a program error (f376f9.749)" and locks the UI for that layer.

Note: The error occurs even on non-smart object layers.

Observed Workaround: The UI becomes responsive again only after adding a second Curves Adjustment Layer on top of the stack. This seems to force a cache refresh/redraw of the Layer Stack, allowing the first layer to function normally again.

Suspected Cause: A race condition or cache buffer overflow in the UXP/Adobe Spaces engine during histogram recalculation when switching between composite and individual color channels on high-end GPU setups.

I have the same issue on RTX 4000 Ada. My workaround: add a second Curves layer, then the first one starts working across all channels

현 최신버전 27.4 에서 곡선 보정중 오류가 뜨고 포토샵이 완전 정지하는 심각한 버그가 있습니다.

작업하는 파일이나 레이어에 상관없이 두가지 이상의 색역을 보정하고 선택하는 순간 포토샵이 정지합니다.

불과 몇시간 전 까진 아무런 문제가 없었으나 갑자기 이 현상이 생긴 이후로는 일관적으로 버그가 발생합니다.

It looks like that after the latest Camera Raw update, the problem is solved, at least for me. Curves just work fine now, I no longer get error messages and Photoshop doesn't freeze anymore.

The same issue i have been facing since I updated my ps to 27.4.0. What is the way forward? Shall I wait for the solution or downgrade it ? Please also suggest the stable downgrade version.
 

Try to disable the Modern UI. Goto the Photoshop preferences on the "Technology Previews" tba in the dialog.

Uncheck the option "Enable Modern User interfaace".

Hey ​@Polacofede, 

I’ve promoted your post to its own thread since your issue may be different from the one you originally commented on.
 

I tried to locate a crash report using the email address associated with your community account, but I wasn’t able to find one. Were you able to submit a crash report? If so, please PM the email address you used to submit your crash report.
 

If not, you can find instructions on how to submit one here:
https://helpx.adobe.com/photoshop/kb/submit-crash-reports.html

Best, 
CMAss

im having this very same issue in windows since last PS update. 

doesnt mind if im at 100% or 33% whatever. Also for instance it works when changing the green channel, then if i try to change the blue one, it crashes. But i would say the crash it quite random. Is a real pain. so it was never fixed?

Photoshop 27.4

I got same problem guys. This is so disappointing issue. Can we downgrade the photoshop version?

It happens to me as well. Everytime I try to change to channel to blue. Photshop froze, have to use taskmanager to shut down Photoshop. I see the original message is already 18 days old. I hope this gets fixed soon. Turning off modern preferences did not work for me.