Hello everyone i had my first problem now with my 2017 MBP 15 inch. So my problem is: I put one wallpaper as background. While it was still with this wallpaper i updated to macOS High Sierra and the problem occurred. Now when i change my desktop wallpaper its changes only the desktop one not the one while i am logging in after restarting the computer or turned it off and on again. And while i change user or log in to mine the bleary wallpaper behing is still the older one. I try to go to Finder/Go/Go to folder then /Library/Caches then delete com.apple.desktop.admin.png then change to other from the default ones then change it to the one i want but the problem occurs no matter what wallpaper i put. So my question is how do i fix this. Sorry if post it again, put the question where it should be but i could not find anything like this connected with Sierra or High Sierra. And also apologise if my English is not good it is not my first language! 