Apart from occasional ghosting experienced by many users (related to static build up), the machine was working perfectly on Windows 10 Build 10240 (the first public release).
It updated itself to the 2nd main release (build 10586) and all appeared to go well, but after the time it took to update, all I did initially was to establish that the main screen and keyboard looked ok, and shut it down using touch on the main screen.
Next time it started up and tried to use the keyboard, the lower touch screen had started to register it's touches on the top screen but mirrored. I have re-installed anything that looks vaguely related to graphics or touch from the recovery app but still no joy. It is definitely a Windows/driver problem, as the smaller boot-up keyboard that appears briefly before windows starts to load, actually registers touch on the lower screen correctly, so the hardware is working as it should.
Currently running on top screen only in tablet mode - fine for web browsing, but as a software developer this is not a workable solution, so have to plug in an external keyboard and mouse.
I have seen a post on Youtube from someone who claims to have got round this problem by reinstalling the recovery apps and drivers, but I've had no luck with this (tried both from recovery app and downloaded from Acer site). Has anyone else had thos probblem and managed to solve it? If so please share your solution.