I have noticed that the number pad on my Typematrix 2030 does not seem to work in Windows 8.1. The num lock key comes on, or lights up when I hold Function, but the number pad responds with random key strokes. Well, probably not random, but definitely not numbers. The other arrow keys (hbmw) and the home and end keys (dt) function as expected with the Fn key held, as do the enter (ctrl), + (shift), - (=), tab (r), / (l), and * (/) keys. For some reason, it seems to be just the numbers.