Why does slide background randomly change color?

Prior to Big Sur, I had used the Photos app to create slideshows. I am now getting a random background color change from black to grey on some of the pictures. It was always a constant black background. It doesn't seem to have any pattern and mostly occurs with the last few pictures in the slideshow. Does anyone know why this is happening and how to fix?

MacBook Pro 15″, macOS 10.15

Posted on May 28, 2021 9:55 AM

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10 replies

May 29, 2021 2:16 PM in response to PMAlvarez

Boot into Safe Mode according to Start up your Mac in safe mode - Apple Support and see if the problem persists. Reboot normally and check again.


NOTE: Safe Mode boot can take up to 10 minutes as it's doing the following; 

• Verifies your startup disk and attempts to repair directory issues, if needed

• Loads only required kernel extensions (prevents 3rd party kernel/extensions from loading)

• Prevents Startup Items and Login Items from opening automatically

• Disables user-installed fonts 

• Deletes font caches, kernel cache, and other system cache files


May 29, 2021 11:26 AM in response to PMAlvarez

Hello PMAlvarez,


We understand you're getting a grey background in slideshows created within Photos on your Mac. We can certainly understand wanting the background color to be consistent during slideshow playback, and we'd like to help you resolve this.


Is this happening with new slideshows you've created after upgrading your macOS, or is it happening with slideshows created prior to upgrading? First we would like for you to install any available updates for Big Sur on your Mac: How to update the software on your Mac. After that, restart your Mac: How to turn your Mac on or off.


Once your Mac is back on, create a brand-new slideshow: Create slideshows in Photos on Mac. Respond back if you continue to experience the same thing. Also, let us know if the issue occurs with new slideshows, old slideshows, or both.


Thanks for using Apple Support Communities.


Take care.

May 29, 2021 1:28 PM in response to Corrie84

Hello and thanks for the reply. My MacBook Pro is up to date with Big Sur 11.4. My issue was with a slideshow created prior to my upgrade to Big Sur. When I made some minor edits to some of the pictures and exported it again, the grey background occurred and generally in the last couple of slides. Re-exporting did not fix this and was attempted multiple times. I just re-created the slide show from scratch after re-booting and it is still happening. I am also now getting some jitter on some of the pictures as they flow along to the music I added (same music as original).


The Photo app now seems unstable with Big Sur.

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Why does slide background randomly change color?

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