I have been searching around for this problem and can't seem to find similar issue/behaviour. I have tried to use default theme and deactivate all plugins but the problem persist.
So whenever I try to edit an image in media library using IE7, the browser will hang and then close automatically. It still fine at Edit Media page, the problem will happen after click the Edit Image button.
In WP 3.4 the same thing also happen.
In WP 3.3.1 works OK.
Anyone can help?