i can answer that one: the music track name is in german, you have to rename the bgm using the german keyboard..that worked for me, it is a simple replacement of letters in order for the music track to be playable when you enter the well..write Düsterer Tüdelkram istead of Dusterer Tudelkram
my keyboard had english and greek..i added german in keyboard options, then changed the name(actually the 2 u letters only) and then changed my keyboard again to default..but if you take a close look at the music tracks names you can find 2-3 more that are written in german..so..your team may need to change the music tracks' names to english so thatr the customers that have english default keypad won't have this silly glitch!
whoever puts such characters in filenames really does not have a professional approach... i'm already against space in filenames but this is really too much
ohh i don't know much about programming etc, but it seemed easy enough to replace all u letters that are german with the english ones, without the 2 dots on top you know?