This is the way it is supposed to work.
Before the update, all movies with Dolby Digital Plus tracks used dynamic range control (DRC). This was bad, because for some action movies it meant that action scenes with explosions, etc. were not at the appropriate volumes, etc. (They should be loud, but DRC effectively makes loud parts quieter and makes quiet parts like dialogue louder.)
Now, after the update, you have the option to turn this on or off. It's under the HD DVD display menu.
I turn DRC on when I am watching a movie at night and don't want to bother my neighbours. Otherwise I leave DRC off, to get the full range of sound, as it was intended.
This is the way it is supposed to work.
Before the update, all movies with Dolby Digital Plus tracks used dynamic range control (DRC). This was bad, because for some action movies it meant that action scenes with explosions, etc. were not at the appropriate volumes, etc. (They should be loud, but DRC effectively makes loud parts quieter and makes quiet parts like dialogue louder.)
Now, after the update, you have the option to turn this on or off. It's under the HD DVD display menu.

I turn DRC on when I am watching a movie at night and don't want to bother my neighbours. Otherwise I leave DRC off, to get the full range of sound, as it was intended.