I recently noticed that when switching from one pattern to another that the next pattern button doesn't reliably flash to indicate that it will soon play, when using the SparkLE interface as a VST inside my host. Sometimes it doesn't appear to blink at all, while at other times it flashes incredibly quickly and not at regular intervals. The problem is somewhat intermittent.
I notice that it appears to improve a bit if I switch over to the Spark interface and then back to the SparkLE interface. It also seems to only happen when used as a VST. It's just a SparkLE issue (which I've started to prefer working with).