Has stopped working

works on 10.04 - on 12.04 you see the mouse pointer on the machine you are
"driving" - for instance in this command

ssh -X user@192.168.1.67 -C "x2x -east -to :0"

controls right screen

on 12.04 you see the mouse pointer but it is locked to the very left of the screen
(you cannot drift it across, right).

Works fine on 10.04 - had reported this problem as being a problem of 12.04 driving 10.04. It is a 12.04 problem. x2x is a basic facility

Can't use 12.04 (and many other people can't) until this is resolved.

I have raised this issue twice with no reply.