Premiere 26.3 exports random footage as black/gold, posterized, or inverted while titles and logos remain unaffected.

System:

• Premiere Pro 26.3.0, Build 93

• macOS 26.5.2

• MacBook Pro with Apple M4 Max and 48 GB memory

• Approximately 283 GiB of available internal storage

Steps to reproduce:

1. Open my approximately four-minute sequence containing video clips with Lumetri Color, plus Premiere-generated titles, lower thirds, and a logo overlay.

2. Export the complete sequence using either H.264 or QuickTime Apple ProRes 422 with Match Source settings.

3. Review the exported file.

Expected result:
The exported video should match the Program Monitor and rendered timeline.

Actual result:
Random video clips export with severe black-and-gold posterization, inverted/negative colors, or colored pixel/grain artifacts. The affected clips change between exports. Premiere-generated titles, lower thirds, and the logo remain completely normal over the corrupted footage.

The same affected clip may export correctly when I export only a short range around it. For example, the first half exported correctly as H.264, but exporting that same first half as ProRes 422 produced black/gold corruption on different clips. This makes the problem nondeterministic and not tied to specific source frames.

Troubleshooting already attempted:

• Hardware and Software Encoding

• H.264 and QuickTime ProRes 422 exports

• Match Source settings

• Disabled H.264/HEVC hardware-accelerated decoding

• Cleared media cache and render files

• Reset Premiere preferences and plugin-loading cache

• Restarted the Mac

• Imported the sequence into a fresh project

• Made cloud-stored project media available offline

• Freed approximately 276 GB previously occupied by After Effects cache

• Confirmed the system had no swap activity or memory pressure during testing

• Confirmed affected clips only have Lumetri Color applied, with no third-party effects