I've noticed a bug with the video playback, if you start a video, go back to the list of videos, and immediately go to the tasknav, you'll notice that it unsuccessfully tries to open a 2nd window a few times.

About the missing ogg/flac support, I was able to reproduce the missing files in the tracker db after the tracker update (which can be fixed with a few dbus calls or a reinstallation of ogg-support), but couldn't reproduce not being able to play the files in question.