Screensaver stuck at "loading photos"
You did well by testing with another user account.
So the problem is in your user account.
Not sure where but that does not matter right now
Lets start with easy step and repair your permissions.
Follow the instructions from Apple.
Lets see if that works, if not we will move to next step.
The (com.apple.preference.desktopscreeneffect.remoteservice[1833]): Service exited due to SIGKILL | sent by com.apple.preference.desktopscre[1833] Sending the Kill (Sigkill) is not a good sign.