First, you don't seem to get much time to cut up corpses. If you're delayed for any reason after killing something it will probably disappear before you get a chance to extract everything.

Second, there appears to be an issue with the right click menu. The first bear I killed I didn't have my hunting knife in hand and whenever I right clicked on the bear corpse the menu would appear for just an instant. After trying a number of times and mentioning this in IRC I realized that I probably needed to wield my hunting knife. But then the corpse disappeared (see issue above).

Next bear I killed I was able to cut up no problem (still not sure what to do with the head...) but when when I tried to cut up a third one I had the same issue as the first time despite still having my knife in hand. Also, I eventually crashed the client after right-clicking a dozen times or so. It's possible that I managed to click the menu just before it disappeared which may have lead to the crash.

I have a video of the disappearing menu captured that I can upload on request.

Here is the log file but it doesn't seem to contain anything relevant:
[spoiler]
// Log File Created At: Thu Jul 22 21:54:20 2010
Thu Jul 22 21:54:20 2010 : Xsyon Version: 20100721.0
Thu Jul 22 21:54:20 2010 : Mode: Windowed
Thu Jul 22 21:54:20 2010 : Data Initialized
Thu Jul 22 21:54:20 2010 : Player Initalized
Thu Jul 22 21:54:20 2010 : Creating Graphics
Thu Jul 22 21:54:20 2010 : Success: Vertex Shader 2.0 Loaded
Thu Jul 22 21:54:20 2010 : Success: Pixel Shader 2.0 Loaded
Thu Jul 22 21:54:20 2010 : DirectGraphics Initalized
Thu Jul 22 21:57:09 2010 : Creating environment
Thu Jul 22 21:57:09 2010 : Creating sun
Thu Jul 22 21:57:09 2010 : Creating moon
Thu Jul 22 21:57:09 2010 : Creating water
Thu Jul 22 21:57:09 2010 : Creating snow
Thu Jul 22 21:57:09 2010 : Creating precipitation
Thu Jul 22 21:57:09 2010 : Loading ambient sound set
Thu Jul 22 21:57:12 2010 : Creating move sectors
Thu Jul 22 21:57:12 2010 : Creating base trees
Thu Jul 22 21:57:14 2010 : Creating surfaces
Thu Jul 22 21:57:21 2010 : Creating sectors
Thu Jul 22 21:57:24 2010 : Creating backdrop terrain
Thu Jul 22 21:57:25 2010 : Creating terrain
Thu Jul 22 21:57:25 2010 : World loaded
[/spoiler]