In Google video (http://video.google.com) it is impossible to see any video with Konqueror. The page loads, but the video player does not appear, not matter what user agent is selected. Might be an nspluginviewer issue, as right clicking on the area where the video should be reveals that it is a flash object.
This should work with 3.5.5, Maksim fixed it recently. *** This bug has been marked as a duplicate of 125076 ***
Thanks, I use a 64 bit system, so I don't use the nspluginviewer from the svn, but the 32 bit version provided by the distro, this is why I didn't notice the fix.