After upgrading to 3.3.5 in confluence v3, all of our profile vcard popups were being truncated horizontally. The problematic CSS is this:
/* fix people directory in 3.0 */
Note the width:30%. I added a width:100% !important override in our theme's custom CSS, which restored the proper width of the contents in the popups. We only have TB applied to part of the site though, so I can't comment on how this impacted the people directory (although fiddling the width value via firebug to be 100% doesn't seem to be problematic?).