The official statement from the WordPress blog said:
“After more than a million downloads of WordPress 3.2, we’re now releasing WordPress 3.2.1 into the wild. This maintenance release fixes a server incompatibility related to JSON that’s unfortunately affected some of you, as well as a few other fixes in the new dashboard design and the Twenty Eleven theme.
JSON, the admin
A little bit tidier
Edge cases covered
Download 3.2.1 or update now from the Dashboard → Updates menu in your site’s admin area.”