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To repro:
You'll notice the previous photo flashes on-screen before the correct photo is shown. This is super annoying when looking at lots of Before photos.
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I can't replicate this, I do not see the flash. I suspect this may be a GPU issue. If you disable GPU in preferences and try again, do you see this flashing?
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If I disable GPU, then yes, the problem goes away. I guess I'll have to do this for now.
For reference, this is my system:
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If turning OFF GPU works, it's a GPU bug and you need to contact the manufacturer or find out if there's an updated driver for it. On Mac, that's part of the OS that needs a fix. This is why disabling GPU is an option as more and more functionality moves to the GPU in newer versions of many Adobe products.
Also see: https://helpx.adobe.com/photoshop/kb/photoshop-cc-gpu-card-faq.html
https://helpx.adobe.com/photoshop/kb/acr-gpu-faq.html
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gpu:%20NVIDIA%20GeForce%20RTX%203060%20(31.0.15.1748)
At NVIDIA the current Studio driver is v537.58, release date 2023.10.10
https://www.nvidia.com/download/driverResults.aspx/212703/en-us/
Interestingly, while NVIDIA rarely mentions any app other than a game in the release notes, this one does mention Adobe
https://us.download.nvidia.com/Windows/537.58/537.58-win10-win11-nsd-release-notes.pdf
Yours, v517.48 was released back in 2022.9.27
https://www.nvidia.com/download/driverResults.aspx/193297/en-us/
You should have an NVIDIA app called GeForce Experience. Use it to check for GPU driver updates, and to install them. Select Studio drivers for creative work as opposed to Game Ready drivers for gamers.
https://www.box.co.uk/blog/how-nvidia-studio-drivers-create-better-performance-and-reliability
And select custom for install type as to force a clean install.
https://www.makeuseof.com/how-to-use-geforce-experience/
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Ah, this was very helpful! (and timely) I always keep my drivers updated, but as was pointed out here, there was a driver update 4 days ago (October 10th) that seems to include fixes specifically for Adobe products. After upgrading my drivers and rebooting and testing again, the flashing issues in Lightroom are gone! If you're experiencing these kinds of problems on an nVidia graphics card, definitely take this latest driver update. Thanks for the advice!
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When I hit the backslash key to view the "before" image, I can see the loupe view flash on screen very briefly. This happens every time I press the button. I've reported a similar issue before:
The only suggestion was "turn off GPU acceleration", but this is a really crappy workaround. I have a very modern machine with a very modern graphics card, and my drivers are up to date. This feels like a Lightroom issue to me.
Windows 11 (latest updates)
Lightroom Classic 13.0.1
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Issue has been resolved with the latest drivers. See my reply above.