Community Manager

P: Glitching playback, including green flashes, during playback and export of 10-bit 4:2:2 media on Windows

Forum|Forum|24 days ago
September 14, 2026
116 replies
1595 views

We're receiving reports of customers in Premiere v26.5 having glitching issues, such as green flashes, during playback and exports.

The issue appears to be specific to media that is:

Long GOP
Recorded in the MXF container
10-bit 4:2:2
Recorded using a Canon camera, including the EOS R5 C, EOS C50, EOS C70, EOS C80, and EOS C400

If you are having this issue with a file that doesn’t match this description, we are eager to hear from you.

We are currently investigating with a top priority to fix this. For now, the temporary workaround is to roll back to v26.3.2. Apologies for any frustrations with this and appreciate your patience while we investigate.

Thanks!
Katie

Pinned Reply By Fergus H

Hi all,

We have identified the cause of this problem and fixed it. A patch for v26 that includes this fix will be available very soon, likely in less than one week.

The fix is also now in Premiere Beta v27.0, build 57 or higher. While we do not suggest customers use beta for production, it is safe to install the beta alongside v26 if you would like to test the fix yourself.

Some customers in this thread have said that rolling back to a version of Premiere v26.x before v26.5.x did not fix the problem - even with the older version, green flashing was still seen in the media. If you’re experiencing this, please hold down the shift key and launch Premiere. In the Reset options dialog that appear, check the box to clear the media cache.

Regards,

Fergus

IslandFox

Known Participant

ITS STILL BROKEN. As a matter of fact I updated to fix another file and now the file that was working is now completely broken with the same issue.

IslandFox

Known Participant

26.5.2 premiere version. I updated windows last night as well see version below

IslandFox

Known Participant

Also oct 6th NVidia driver. see below

WANG DONGLIN

Participant

The green-screen flickering issue has been resolved in Premiere Pro 26.5.2. However, I’m still experiencing another issue that also occurred frequently in 26.5.1: timeline playback does not work properly. The preview image freezes, while the audio continues to play and the playhead moves forward normally.

来源

J

Jonathan Editor

Community Manager

Hi @WANG DONGLIN,

Thank you for confirming that the green-screen flickering issue has been resolved in Premiere Pro 26.5.2. For the team to try to better assist you, can you please provide additional details:

Please specify Windows or macOS, along with the version.
- Chip (Mac Only): Specify which M-series Chip or CPU/GPU combo.
- GPU Driver (Windows only): Please let us know your video card driver version. We recommend updating to the most recent version; for NVIDIA users, we strongly recommend the Studio version of the driver.
Does the timeline and source specs match? (e.g. frame rates)
- Please confirm that the timeline is displaying frames and not the audio time units.
Is there a change in playback performance if the video previews on the timeline are disabled?
Is this occurrence with footage shot on a Canon EOS C70 or another source?
- Please confirm the camera/footage specs.
If possible, are you able to share a screen record of when this issue occurs?

Best,

Jonathan

WANG DONGLIN

Participant

Hi Jonathan,

Thank you for following up. Here are the details you requested.

My system is running the latest updated version of Windows 11 64-bit. The hardware configuration is:

CPU: Intel Core i7-13700K (3.4 GHz)
RAM: 128 GB DDR5
GPU: ASUS NVIDIA GeForce RTX 4070 12 GB
Integrated GPU: Intel UHD Graphics 770 (128 MB)
Storage: Samsung 990 PRO 4 TB M.2 SSD
NVIDIA driver: Studio Driver 6.6.92, dated September 9, 2026

I drag the footage directly onto the timeline, so Premiere Pro creates the sequence using its default settings based on the source footage. Please see the attached screenshots for the sequence and footage specifications.

The footage was shot on a Canon EOS C70 in C-Log 2 using a Long GOP codec. Please refer to the screenshots for the detailed camera and footage settings.

I have also uploaded two screen recordings showing the behavior:

With timeline video previews enabled, Premiere takes a very long time to display the current frame after I drag the footage onto the timeline. Once the frame appears, it does not continue playing.
With timeline video previews disabled, as you suggested, the behavior improves somewhat, but playback and scrubbing are still very laggy.

Please let me know if there are any other settings or tests you would like me to check.

Best regards,
WANG DONGLIN

Share test video link: https://photos.app.goo.gl/h2JQH9xsWM63pqcE8

KatieToo

Author

Community Manager

Update for all on this post: Thanks for taking the time to report on this. This issue has been fixed, and that fix is now available in the latest release of Premiere v26.5.2.

If you update and still see the problem, please reply here with your exact version and build of Premiere on what OS, and we will take another look.

Thanks again for flagging this, and reports like yours are what get these fixed.

Much appreciated,
Katie

IslandFox

Known Participant

While we have the dev team’s attention, can I volunteer some of my time to test closely with you guys and help make sure a hiccup like this doesn’t make it into another release?

This issue keeps popping up with XF-AVC, and I’d genuinely love to help test it in real-world workflows so we can hopefully avoid this altogether going forward.

S

scottmcphotog

Participant

Just a reminder that Canon users actually account for a percentage of marketshare in professional video cameras.

Fergus H

Pinned

Community Manager

Hi all,

We have identified the cause of this problem and fixed it. A patch for v26 that includes this fix will be available very soon, likely in less than one week.

The fix is also now in Premiere Beta v27.0, build 57 or higher. While we do not suggest customers use beta for production, it is safe to install the beta alongside v26 if you would like to test the fix yourself.

Some customers in this thread have said that rolling back to a version of Premiere v26.x before v26.5.x did not fix the problem - even with the older version, green flashing was still seen in the media. If you’re experiencing this, please hold down the shift key and launch Premiere. In the Reset options dialog that appear, check the box to clear the media cache.

Regards,

Fergus

H

HHS PR

Participant

Have there been any updates on this?

Amy the Stuv

Community Manager

The fix for this has been released in Premiere 26.5.2, although you may still need to clear you Media Cache on launch if you are still experiencing Green Flashes. Let us know.

Best,

Amy

B

brianh7525331

Participant

Rolling back to 26.3.2 didn’t work. Tried going back to 26.2.2 and then the .mxf files wouldn’t play at all and would crash the playback altogether. Still green frames in the Beta as well. This literally worked fine a couple weeks ago until the recent update for 26.5. Now EVERYTHING is messed up, which doesn’t make any sense.

Most all of my footage is LongGOP .mfx files from C70 and C50 cams and I’ve had 0 problems until now. The only thing saving me with my time sensitive projects is “render and replace”ing clips or fully transcoding the footage (in Davinci, btw… which is FREE….).

B

brianh7525331

Participant

Aaaaaand, nevermind. Just got green frames in my “rendered and replaced” clips.

Furious.

B

brianh7525331

Participant

Update: 26.2.2 works if I start a new project ONLY. For existing projects, everything goes haywire with playback, even after deleting media cache files.

IslandFox

Known Participant

Any updates on this issue? Are my files just broken now? Do I need to start from scratch?

KatieToo

Author

Community Manager

@IslandFox Responded in DM, check there, but to summarize, merging this post onto the main P: with a fix coming in soon and temporary workarounds in the meantime, some on 25.6.6 or 26.3.2 or even v27.0 Beta.

Thanks for your patience,
Katie

F Demontagne

Participant

26.2.2 seems ok for me. v27.0 Beta does not work, 26.3.2 is even worse

bob_0430

Participant

Yes, I am experiencing it with files from a C300 mk2.

2048 x 1080

Long-gop

MXF

10-bit 422

I opened the same files in Premiere v 25.2.3 build 4 and it plays fine.

A

adaptable_detaild63a

Participant

Hi! Experiencing the same issue. I’ve been following since last week and it doesn’t seem they have fixed it yet. I rolled back to 25.6.6 and that has worked for me. Super lame to have to go back so far, but at least I can get my videos edited. Hope we all get an email once they fix this (maybe a free year too?).

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