I have the keysonic ACK-340BT keyboard with touchpad and left-right buttons, i was using with an acer tablet and win 8. After upgrading to 8.1 the touchpad and buttons stopped working, rest of the keyboard works. tested on another 8.1 machine and same issue.

So something changed from 8 to 8.1 that made the touchpad not working, any idea what?

edit.. it uses the Novel Smart-Touchpad