Hey, there. I had the same problem at the first time I used Spark and SparkLE. Did you store your Drumkits/Projects in the default folder during installation or did you change something in the path? For me it did the trick, that copied my Soundsets to the default folder. I don't know, why it only worked in the default folder, but although I've changed the path in the Spark GUI, it didn't work (always crashed after a few bytes, the GUI got frozen). After I I've changed back to default pathes, it suddenly worked!