Al,
I had a similar problem a few years ago, due to my incorrect position when working at my computer (the keyboard and the mouse were too high for my forearm and wrist to extend properly). Another big culpit was my old Microsoft mouse, with his "arched" back. Everything disappeared moving the computer to a lower stand and replacing the Microsoft with a "flat" Logitech mouse. A lot of computer addicts seem to have the same problem; so, at least this time, I don't think that you have to blame your Tyros for this.
Andrea
(the italian in Italy )