Yes, Rhonda, it happened to me too, just once or twice in a year.
If I recall, we did the same thing you did, the 2 solutions you've found out, pressing S key, or closing Gentle Piano and even disconnecting and reconnecting midi-Usb cable.
I didn't check the same software on other computers. So I thought it was an Operating System or keyboard recognition problem.
Thank you for pointing it out. Let us know if the problem persists and we'll look more into it.
For now, to help us find the cause, I'd like to know the operating system was the same on all computers? And did you use, for midi-USB connection, the same cable on all computers you tried?
My OS is Windows XP Professional, and I have USB Uno 1-1 cable.
Andrea