Hey everyone, I am having an issue hooking up my digital piano to my computer via MIDI USB cable I have a Yamaha digital piano and a MacBook Air. Last weekend I bought a MIDI USB cable and it worked great! I plugged the MIDI OUT to the IN, and the MIDI IN to the OUT, plugged in the USB to my computer, it automatically synced, and I could use my piano playing program Playground Sessions just fine. The note I played on the keyboard showed up on my computer no problem. Throughout the week there was a slight glitch in the program, marking a note that I didn't play, so I uninstalled the Playground Sessions software and reinstalled it. After I did that, now when I plug in the MIDI USB cable, the keyboard and computer do not sync. When the cable is plugged in to the computer, the MIDI light is on showing it's getting power, but neither the IN or OUT lights are on, so it's like a MIDI input or output setting is not correct. I didn't change anything setting-wise, I just reinstalled the piano software. I have tried changing the MIDI IN and OUT ports in to the piano, but still nothing. Does anyone have any suggestions on getting the MIDI input/output correct again? Thank you!