If you’ve had your custom background image disappear after upgrading to WordPress 3.3, here’s a quick fix to bring it back.
- Go to the appearance section and select edit to open up the theme editor.
- From the list of files on your right, choose header.php
- Look for this spot:
and replace it with this:
- Save your changes
That should bring back your custom background image. All of the affected themes have an update available to that fixes that as well.
If you have any trouble, just let us know.