I currently have this issue: I set the background image on my WordPress website (it's here http://guido1993.wordpress.com/ )
I actually set it clicking on my name, then personalize, then Background selection from the right bar and choose it.
It actually gets uploaded and I can see it applied. I click save and then I close the browser.
As soon as I open my website again, the background image is gone.
I have tried this multiple times but I always get the same result.
Any hint? Thanks in advance for any help!