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[BUG] White horizontal block artifacts on export — AMD RX 5600 XT, Windows 11, Premiere Pro 2026

Forum|Forum|1 day ago
May 24, 2026
2 replies
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**[BUG] White horizontal block artifacts on export — AMD RX 5600 XT, Windows 11, Premiere Pro 2026**

I've been experiencing persistent white horizontal block artifacts on exported footage in Adobe Premiere Pro 2026 and I haven't been able to find a permanent fix despite extensive troubleshooting. I'm hoping someone here has encountered this and found a solution.

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**System Specs:**
- CPU: AMD Ryzen 7 3700X 8-Core (3.60 GHz)
- GPU: AMD Radeon RX 5600 XT (6GB GDDR6)
- RAM: 32GB (2400 MT/s)
- Storage: 1.81 TB
- OS: Windows 11 Pro (Version 25H2, Build 26200.8457)
- Motherboard: B550M AORUS ELITE
- Adobe Premiere Pro 2026
- Adobe Media Encoder 2026
- AMD Adrenalin Driver: 25.10.2

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**Project Setup:**
- Source footage: Sony A6400, H.264 MP4, 1920x1080, some clips tagged xvYCC709 color space
- Sequence: 1920x1080, 30fps, Progressive, Rec. 709
- Export: H.264, CBR 15 Mbps, Progressive, Rec. 709, via Media Encoder
- Files sourced from Box Drive (company policy, local storage not permitted)
- Timeline contains nested sequences with time remapping applied

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**The Problem:**
White horizontal block artifacts appear scattered across frames during export. The glitch is particularly severe on clips that have **time remapping** applied, including on pre-transcoded clips. The issue started around November 2025 and has been consistent since.

**Sample screenshot attached.**

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**What I've already tried:**
- DDU clean uninstall + AMD driver rollback to 25.10.2
- Disabled H264/HEVC hardware accelerated decoding AND encoding in Preferences > Media
- Made all Box Drive footage available offline before exporting
- Modify > Interpret Footage → set xvYCC709 clips to Rec. 709
- Verified sequence color space is Rec. 709 throughout
- Software Encoding in Media Encoder (not GPU)
- Pre-transcoding footage before export (partially helps but glitch still appears)

**Note:** The same project exports cleanly on a MacBook (latest Premiere version), suggesting this is a Windows/AMD-specific issue.

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Any help is greatly appreciated. This has been affecting my production workflow for months.

Thank you!

IanB_360

Community Manager

Hi @mal_3931
A few questions:

Does the artifact appear in Premiere's Program Monitor during playback, or only in exported files?
If you render and replace a problematic time-remapped clip before export, does the artifact still appear?
Are the white blocks always appearing on the same frames, or do they move between exports?
Does exporting directly from Premiere (without Media Encoder) produce the same result?
Have you tested with GPU Acceleration disabled in the Project Renderer settings, if available?

The correlation with time remapping is particularly interesting, especially since you've observed the behavior on both original and transcoded media. It would be helpful to know whether the issue survives a Render and Replace workflow, as that may help determine whether the artifact is being introduced during frame generation rather than final encoding.

Thanks again for documenting the troubleshooting steps you've already completed.
Here to help
Ian