This is probably one of the most frustrating bugs which leads me to
remember why I stop using Totem from time to time.

If you have a playlist that you're working through, and you then click
on a media file (which opens in the default, Totem) it wipes your
playlist, stops playing what you're playing and you loose your playlist.

If you are working through a playlist of videos/podcasts etc. losing
your place and track of where you are in a list of 10/20 files this is
unbelievably annoying.

Steps:
1. Open Totem
2. Add several items to the playlist for listening/viewing
3. Start listening to an item in the playlist
4. Open a Nautilus window
5. Browse to a media file
6. Click on a media file
7. Note how what you were doing is now gone and playlist lost, you're now watching that video

What should happen:
Either a new instance of Totem which doesn't lose what I was doing, or add the new file to the playlist.  What it certainly should not do is wipe something I took time to get set up and stop playing something that I'm in the middle of.  I might pause what I'm doing and then want to quickly view a small video/audio file, I still want to return to that activity.

Current Work-around:
Don't use totem for playlists, or set something else as the default handler.  If you do these things, then it won't wreck your playlist because you're using two different apps for the same thing.