khpro audio problem-music choppy

[Vi Harris]

Love your program and been using successfully for a year. Now, when I import the .wav file and start to create new song, the music is garbled, choppy, stutters making it impossible to place lyrics. Tried several files, same result, even opened completed songs that before, played fine and now they even play back "stuttery". I can't think of another word to describe how the music sounds. What could be wrong?