Quick update: the offending file is sound (0,10). This wav was saved in
Broadcast Wave Format, which triggers a bug in the build of sdl_mixer that we're using. We're still deciding what to do about this problem. Note that the file is unusual, but not invalid; it's a bug in the loader.
If you want a workaround now, it might work to copy-paste this file into a new wav using an audio editor, and then rebuild the .snd with the new copy. Another workaround, if you can use a hex editor, is to open up the wav and delete the 'bext' chunk (offsets 0x00C - 0x36D, inclusive). We'll have a better solution for you later.
