MacOS – Make OS X El Capitan announce time only when screen is unlocked or during night time

I just tried "Reset Home Folder Permissions and ACLs" and it looks like it might be helping. I ran this for about 30 minutes, canceled it because it took too long, backed up Time Machine again, and noticed that Time Machine backed up some files that I did not touch. Turns out that these files were the same ones being locked in backups, and in the latest backup, they were no longer locked.

So perhaps I was having permission problems with the files that were getting locked? I don't know if this "fix" will resolve this permanently, or just for now, but it certaily seems to be related.

I'm late to the party, but this should work for you:

-- Set user_project_path to the folder that contains this AppleScript
set user_project_path to POSIX path of ((path to me as string) & "::")

-- Assuming your images are contained in user_project_path directory inside an images folder
set images_directory to user_project_path & "images/" as string

tell application "System Events"
  set desktopCount to count of desktops
  repeat with desktopNumber from 1 to desktopCount
    tell desktop desktopNumber
        -- Change my-desktop-image.png below to the name with extension of your desired image
        set picture to images_directory & "my-desktop-image.png"
    end tell
  end repeat
end tell

If you have questions, let me know