High Sierra login screen background stuck to one image

Problem solved.

If you want to change your login screen to something different than the default High Sierra image, here's what you do.

1. Log in as the Root User (if you don't know howto do that, then you shouldn't be attempting this at all).
2. Open Finder.
3. Go to, /Library/Desktop Picture/High Sierra.jpg.
4. Change the name of ~High Sierra.jpg to anything else (to save it) or just delete it: in my case I changed it to ~High Sierra X.jpg.
5. Move or paste the desired .jpg file into the same folder.
6. Rename it, ~High Sierra.jpg.
7. Log out

When you log back in the login screen will be a blurred image of whatever you selected in place of the default image.

Enjoy,

Movlas

Lisa II > Mac Pro 5,1

Here's a much simpler way to do it. (No need to log in as root.

1. In Finder, Navigate to the photo you'd like to see blurred in the background at start up.

2. Click on the photo's title. (No need to open the file.)

3. Go up to the top of the Finder screen and click on the Gear to drop down the menu.

4. Choose the last menu item: "Set Desktop Picture."

5. You're done.

NOTES:

• If you had your desktop set up to change the background photo every hour, you'll need to go back and re-set that.

I have the same exact problem. Running High Sierra 10.13. Tried multiple fixes and cannot get to work including this link: https://www.macworld.com/article/3128967/macs/how-to-change-your-login-screen-in -macos-and-change-it-back.html

Thanks John

The issue has been fixed on this week’s High Sierra 10.13.1 update!

At least everything is working as usual since that update, meaning that by simply changing the desktop background the login screen after rebooting changes automatically as well.

Regards,

Ximo

Could you check how many desktop you have and which wallpaper on Desktop 1 ?

Thanks for the tip, I have two displays (Macbook Pro 2015 and 27” Dell) with one desktop, let me review that anyway

I have the same issue on my macbook pro 13" retina early 2015 and now i' m at the telephone w/ apple support but we both (me and the tech support) are not able to solve this... so annoying!

Is yours the first user account on your mac?

The login window background is a blurred version of the desktop image of user 501 (the first account created, which always an administrator).

Thanks for replying

Yes, only one user and the UniqueID is 501

I guess this is a bug...

guys just to make a check, wich mac do you have and do you have installed google backup and sync ( google chrome)?

Hi,

yes I have installed Google Chrome with profile settings syncing. Uninstalled but the issue persists.

No light here...

Thanks