I don't know if this issue is already known, so I thought I'll point it out just to make sure.
I have the music data for each game in the .ogg format. As of the build version 2013-06-06 and onwards, all the games no longer play the .ogg files, so no music is heard. Previous builds work fine.
Sorry if that isn't enough info needed to solve the problem, but I used the "Touhou Vorbis Compressor" program to convert the music to .ogg. Thanks in advance :-)