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KatieToo
Community Manager
KatieTooCommunity Manager
Community Manager
Sep 14, 2026 5:48 PM UTC
Released

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

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

       

       

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      122 replies

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      Hi Refinition
      Participant
      Sep 18, 2026 2:10 AM UTC

      Just encounter this issue with Canon C70 MXF. 
      W11, RTX 3060 12gb.?

       I updated the studio driver and also Blackmagic video driver. 

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      D_Mac_Man_44
      Participating Frequently
      Sep 18, 2026 12:07 AM UTC

      I can report the same issue with Canon C50 MXF long GOP 10 bit 4:2:2 on my home system Windows 11 Nvidia 4080 Super. 

      But, my work computer is NOT having this issue with the same exact footage. 

      t’s a Windows 11 Nvidia 5080

      Both systems are on the latest Nvidia studio driver 616.92

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      HHS PR
      Participant
      Sep 17, 2026 10:49 PM UTC

      I was experiencing the green flicker and fall squarely into the specific media parameters you listed. However, rolling back to 26.3.2 presented worse issues, where not only did I get a more constant green flickering but also had artifacts of other clips appearing when viewing in the source monitor.

      Rolling back to 25.6.6 now in hopes I can continue to work.

      Translate
        vaughni55939617
        Participant
        Sep 17, 2026 10:59 PM UTC

        Same, I don’t know why the older version was affected even though previously it wasn’t. something to do with the backend maybe. but I hope this gets fixed soon. Let us know if rolling back to 25.6.6 works for you.

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        HHS PR
        Participant
        Sep 18, 2026 12:36 PM UTC

        25.6.6 is working well so far, but we’re sacrificing some of the major updates that were introduced in the 26.x.x updates. For me, doing without the object selection tool for masking is a huge drawback. 

        But at least I can continue to edit while Adobe figures this out - hopefully very soon.

        Any updates ​@KatieToo?

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          brendonf
          Participating Frequently
          Sep 17, 2026 2:44 PM UTC

          Can i just add, when using the white balance picker under basic lumetri color on an adjustment layer over c-log 3 it jumps both tempature and tint far left making the footage tinted green. Does not do this on an adjustment layer over my .mp4 footage.

          v26.5 EOS R5 MXF S-Log 10bit

          GPU NVIDIA 5080 asus studio driver

           

           

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            dsymonds421
            Inspiring
            Sep 17, 2026 12:41 PM UTC

            Since they seem intertwined, do we have to revert Media Encoder back to 26.3.2 as well?

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              vaughni55939617
              Participant
              Sep 17, 2026 12:56 PM UTC

              yes actually, same with after effects.

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              dsymonds421
              Inspiring
              Sep 17, 2026 12:05 AM UTC

              Still seeing this issue after updating to 26.5.1 today. Only Premiere... I see that Guides are now fixed at least. Dev team manages to break the most basic features with new versions.

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                Jai308338933xkm
                Participant
                Sep 16, 2026 10:24 PM UTC

                I’ve just rebuilt my project in 25.6.5. That works - a pain to migrate, I was experiencing the Green glitching in 26.5 with Canon (MXF wrapper)

                 

                My system is 

                Windows 11 Pro

                Nvida Studio GeForce RTX 4060 Ti Driver 616.92

                Intel Core i7-14700K

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                  vaughni55939617
                  Participant
                  Sep 16, 2026 2:55 PM UTC

                  Hello Katie! I appreciate you noticing this bug. I work with MXF files and this is the first time I have had this experience. Canon MXF 10 bit, having glitches, green screen flashes and or sometimes laggy playback. Also, sometimes premiere prompts and error that rtx 3060 12gb vram is not supported and what not. One question, when do you think an update with the fix is released? I really appreciate you Katie!

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                    IslandFox
                    IslandFox
                    Known Participant
                    Sep 16, 2026 1:01 PM UTC

                    Update: The only thing that has no issues currently is adobe premiere pro beta.

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                    giacomo22944380ie7t
                    Participant
                    Sep 16, 2026 10:54 AM UTC

                    Hi Katie,

                    Confirming this matches my case exactly: Canon EOS R5C, XF-AVC Long GOP, MXF container, 10-bit 4:2:2. Green flash frames appeared in Premiere Pro 26.5's preview and export, not present in VLC or other players, and confirmed not to be a corrupted source file (plays back cleanly elsewhere).

                    I went through extensive hardware troubleshooting first (GPU swap, RAM, motherboard replacement, clean Windows install) before finding this thread — all of that turned out to be unrelated. Rolling back to v26.0 resolved it completely for me with the exact same files.

                    Happy to provide a sample MXF clip if it helps narrow down the fix. Thanks for looking into this.

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                      KatieToo
                      Community Manager
                      KatieTooCommunity ManagerAuthor
                      Community Manager
                      Sep 16, 2026 2:24 PM UTC

                      ​@giacomo22944380ie7t Thank you for giving us those details and letting us know v26.0 was working for you. Yes, let me DM you our Dropbox upload link to grab that sample file for the engineers. Sorry for the frustrations with this, much appreciated!

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