I'm having an issue with certain background images not rendering on mobile devices. Is there something I'm doing wrong?
If it's about iOS devices there are restrictions on iOS. Images have to smaller than 250KB. Beside that you should link us a troubleshooting link. You can find it in site settings
Here's one page it doesn't work on:
It does however work on the home page though it's a different background image:
I figured it out: I had to uncheck the Convert to sRGB option when I exported the JPG in Photoshop CS6.