Wait!!!!!

It might be when I used mobile to switch backgrounds! 
IDK but I just came across the image I used way back when Paul first noticed this and it was stored on my phone. 
https://forums.delphiforums.com/hosts/messages?msg=28949.3

So I used the image from the previous message on one of my (many) owned forums, uploading it with mobile. Backgrounds on about half my own forums changed plus many I do not own.

and many many more (sorry folks)

I'll try from desktop in the morning.

:D

neato ...

Right! 
Anyway I'll try from desktop tonight when its a little less annoying to the multitudes 

Repeated from desktop with similar results. 

?

Notes:

I was unable to upload any files to either the custom backgrounds, headers or even to embed in a post from Firefox and Chrome. Edge I was able to, however it gave me an error message but did successfully upload and install my graphic. 

I can see the images on other forums from the same computer on other browsers - however they do not show at those forums from my phone.  In fact I cannot find any. 

One possibility with that graphic error is I am using it as a forum badge on another forum. 

Anyhoo - I don't know why (may common servers) this happens but it does and it is not a mobile thing or a browser one... and it is temporary. 

A Kid by any other name... (Kidmagnet) said:

I was unable to upload any files to either the custom backgrounds,

Me too, no image I try works.

Uh oh... ummm it wasn't me.

(skidaddles!)

Nah, I blame @Showtalk. She was messing with that strange background  image.