I've been, without success, trying to get pd and arduino talking within Vista. Pduino kept crashing, so I tried SMS and at first had no luck. I followed instructions and then opened the simplemessagesystem pd patch and, like Pduino, it crashed. But I try again and, voila, it works. I had an led in pin 13 which I toggle on in pd patch. Light comes one. Close and redo---- to verify it works--crashes as before. Try again, works one more time. Subsequent tries produce original crash. I'm doing the exact same procedure each time. I'm a bit frustrated. Any ideas why it works only a few times out of many attempts?