And so, our story begins...

I can't believe I just spent over half an hour changing my desktop wallpaper...

I had the wallpaper on a USB... It just wouldn't display properly.

Set it to "tiled", works fine.
"Center"... Still good.

Stretch? nope.

The colour borks and it becomes worthless.

This is what the wallpaper looks like, for those that are interested.

[NOTE - not the actual one that borked. This one borks differently.]

Seems, in my haste while saving it, I didn't save it properly.

It was a .bmp file, but I saved it straight into a .png.

Which fudged the colours. Saving as .bmp, then resizing, then resaving as .png in paint makes it work properly.

~The more you know.