Király wrote:
After deleting the .plist file, return to System Preferences and reset that account's Desktop picture to the one you want. It should then display correctly at login without momentarily flashing any other picture. It worked for me anyway.
As suggested I deleted the desktop.plist file for each of my administrator and several user accounts, a process which took several restarts as for reasons unbeknownst in some of the accounts I couldn't delete the desktop.plist until after one or more restarts. I finally reached the point where the background screen for each of the accounts was the Aurora. I then for each account used the Desktop & Screensaver option in System Preferences to set the background to the preferred one. After doing that I restarted and opened the accounts one at a time. This time the preferred background appeared instead of Aurora. However when I went through and opened each account the second time, this time when all accounts were active, the Aurora sometimes appeared.
So there must be a location where the Aurora is saved and I would assume if I knew where I could replace the Aurora with a background of my own choosing.
