This is a bit weird.
I updated to 3.3 on a site that I am migrating over from an old server (I don't think this has anything to do with it, but it might). Now anytime I add pictures, I can find them, select them, and upload them just fine, but when they are fully oploaded, they say that their dimensions are 0x0, there is no thumbnail, and it seems to have a file size of 0.
I am using Antisnews 1.9 with WordPress 3.3, using Chrome 15.0.874.121 m.
When this first happened, I tried uploading other types of images, same problem. I disabled all of my plugins (i do have NextGen Gallery), and briefly, it started to work (I could upload images, they would show up properly). Then all of a sudden, the problem came back. I didn't do anything in between other than uploading two images, deleting a few posts and adding tags to existing posts.
I have tried disabling all plugins, re-uploading a clean installation of WordPress, and reverting to Twenty Eleven. Even with these changes, I am still unable to upload images.