Premiere Pro 26.5.2 causes GPU reset and complete system freeze on Intel iMac with AMD Radeon Pro 5300

Issue:

After updating Adobe Premiere Pro to version 26.5.2, my 2020 Intel iMac experienced two complete system freezes while editing video. The entire computer became unresponsive and required a manual forced restart.

macOS generated a GPU Reset diagnostic report identifying the AMD Radeon Pro 5300 graphics processor and Adobe Premiere Pro as the application associated with a pending GPU command.

System configuration:

• Computer: Apple iMac Retina 5K, 27-inch, 2020

• Processor: 3.3 GHz 6-core Intel Core i5

• Graphics: AMD Radeon Pro 5300, 4 GB VRAM

• macOS: 26.5.2 (Build 25F84)

• Affected application: Adobe Premiere Pro 26.5.2

Steps to reproduce:

1. Launch Premiere Pro 26.5.2 on the above iMac.

2. Open an existing video editing project.

3. Perform normal timeline editing operations.

4. During editing, the entire computer may become unresponsive.

The freezes were intermittent, so the precise triggering operation has not yet been isolated.

Expected result:

Premiere Pro should remain responsive during editing, without causing the operating system to freeze.

Actual result:

The entire iMac froze, requiring a forced restart. No normal Adobe crash-reporting dialog appeared.

macOS diagnostic evidence:

A GPU Reset report was generated on October 29, 2026, at 13:01:41.

Relevant entries:

Event: GPU Reset
Graphics Hardware: AMD Radeon Pro 5300
Restart Channel: 21 SDMA1
FirstPendingCB: PID = 614, Name = Adobe Premiere P
SDMA1: BUSY
RSMU Timeout Events Recorded: 5

The report indicates stalled GPU processing involving the SDMA1 engine, with a pending command associated with Adobe Premiere Pro.

Workaround and comparative results:

I installed a Premiere Pro version two releases older than 26.5.2.

Since rolling back, I have successfully completed three separate editing projects without another system freeze or GPU reset.

This suggests a possible regression or compatibility issue introduced in a more recent Premiere Pro release, although a hardware or driver interaction cannot yet be ruled out.

Additional information:

I can provide the macOS GPU Reset diagnostic report and associated GPU tailspin file for further investigation.

I would appreciate having this investigated as a possible regression affecting Intel-based iMacs with AMD Radeon Pro graphics hardware.