I tried to reproduce this bug, If I choose an picture in my home folder, it works for me.
Could you confirm your picture files permission? I wonder the permission can be read by current user only.
If the path is ~/background.jpg, try to get the permission file by "ls -l ~/background.jpg"
I tried to reproduce this bug, If I choose an picture in my home folder, it works for me.
Could you confirm your picture files permission? I wonder the permission can be read by current user only.
If the path is ~/background.jpg, try to get the permission file by "ls -l ~/background.jpg"