Windowless flash content such as the one at http://www.cnn.com/video does not seem to work properly. This problem only shows up when using QtWebKit 2.2 on a 64 bit Linux box with nspluginwrapper and the current official 32-bit adobe flash player plugin (v10.3.181.34). The aforementioned site and many others like it work just fine on the same step up when using QtWebKit from git master.
I managed to reproduce the problem with QtWebKit-2.2 (as of today) on a 32bit Linux box (Fedora13).
After a couple of hours of bisect (slow machine for the build), I managed to find the commit that fixed it on trunk and cherry-picked it into qtwebkit-2.2: r86706 (Bug 54051)