Personal wallpaper keeps reverting to default

[wrecclesham]

My personal wallpaper on my DS920+ keeps reverting to the default blue one every time I log back in again.

Any idea what's going on?

 

[wrecclesham]

To answer my own question:

I've discovered that the personal desktop wallpaper only persists between sessions if you set the fit to "Center".

Any other fit option and it will revert to default. Does anyone know why this happens?