music issues

[Kman]

I recently started playing black plague and i've noticed an issue with it. For some reason the music won't change in different rooms! For example, i'll run into a monster and the theme for the monster will start playing, then he'll eventually leave but the same song will still be playing, and then after i've kept playing for about 40 minutes it's STILL playing. And I know this shouldn't be happening since I watched part of a LP of it and the music was changing from room to room. I noticed this same thing happening in overture but eventually it stopped, but now 2 and a half hours in to black plague the same song is still playing. Does anyone know how I could fix this? Also another thing I noticed that might be related to this is that the monsters don't disappear after a while, like with the first monster run in I sat around waiting for him to leave for over 3 minutes and yet he didn't move. Not sure if it's related in any way but I thought I'd bring it up just incase.