I am running WordPress 3.3 in a multisite environment. After upgrade to 3.3 today, any new images that are uploaded to the site don't display in the browser. It returns a 404. (Oddly, some images do display but only display half way). You can see the problem here: http://craftgossip.com.
I have deactivated all plugins and that has not made any difference.
Any pointers appreciated!