I'm starting the sound in "After Entering Room" and I'm playing the sound within that script. I also made sure that after you leave the room, it stops.

What I'm confused about is the fact that this EXACT same .mp3 file has worked before - so have other sounds I've used, it's currently not working now, however.

My guess is that I probably did it right the first few times, and then I forgot.

I edited the sound down to 10 seconds in another program, so I don't think that it might be too long or anything like that.

There are a number of things it could be, but I'm always suspicious of filenames with spaces in them - especially since this an HTML environment, and it tends to want to turn spaces into "%20", etc.

So I would try renaming the file without spaces. Make it short and sweet and spaceless as a test, and see if that helps.