Here's my report aswell on the sound/config problem, as an addition to strom's:
* Custom install location, japanese locale installation, playing in japanese locale, PROBLEM STILL EXISTS.
* Custom install location, swedish (home) locale installation, playing in swedish locale, PROBLEM STILL EXISTS.
* Custom install location, english (usa) locale installation, playing in english (usa) locale, PROBLEM STILL EXISTS
* Default install location, japanese locale installation, playing in japanese locale, using strom's english locale config file and using it the way he describes in his post -> PROBLEM STILL EXISTS.
In other words, nothing I've done so far has gotten rid of the problem. I still need to either delete the config file or make it blank and read-only in order to make the sound work again after restarting. Nothing else has made any change so far for me.
If the problem actually had to do with the game being installed in a certain locale or being played in one, then that solution should also work for me just fine, but it doesn't, so it can't be that. And yes changing locales works just fine for me.